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Revision Control Revision Print Date Initial Release (K80713–9) June 1996 Revision 1 (101033–1) November 1996 Revision 2 (101033–2) August 1997 Revision 3 (900239–1) February 1998 Revision 4 (900239–1) October 1998 Revision 5 (901047-1) October 1999 Revision 6 (901047-2) May 2000 Revision 7 March 2002 Revision 8 February 2006 Important Notices ©2006, Crown Broadcast, a division of International Radio and Electronics, Inc. Portions of this document were originally copyrighted by Michael P. Axman in 1991. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form by any means without the written permission of Crown International, Inc. Printed in U.S.A. Sony and RCA are trademarks of their respective companies. Crown attempts to provide information that is accurate, complete, and useful. Should you find inadequacies in the text, please send your comments to the following address: International Radio and Electronics 25166 Leer Drive, P.O. Box 2000 Elkhart, Indiana, 46515-2000 U.S.A. ii Contents Section 1—Getting Acquainted ..................................... 1–1 1.1 Your Transmitter ............................................................................................... 1–2 1.2 Applications and Options ................................................................................... 1–3 1.2.1 Stand-Alone .................................................................................................. 1–4 1.2.2 Backup .......................................................................................................... 1–4 1.2.3 Booster ......................................................................................................... 1–4 1.2.4 Exciter ........................................................................................................... 1–4 1.2.5 Translator ...................................................................................................... 1–5 1.2.6 Satellator ...................................................................................................... 1–6 1.3 Transmitter/Exciter Specifications ..................................................................... 1–7 1.4 Receiver Specifications ..................................................................................... 1–9 1.5 Safety Considerations ...................................................................................... 1–10 1.5.1 Dangers ...................................................................................................... 1–10 1.5.2 Warnings .................................................................................................... 1–10 1.5.3 Cautions...................................................................................................... 1–10 Section 2—Installation ............................................... 2–1 2.1 Operating Environment ...................................................................................... 2–2 2.2 Remove PA Tray Spacers .................................................................................. 2–2 2.3 Power Connections ........................................................................................... 2–3 2.4 Frequency (Channel) Selection .......................................................................... 2–5 2.4.1 Modulation Compensator .............................................................................. 2–6 2.4.2 RF Tuning Adjustments ................................................................................. 2–7 2.5 Receiver Frequency Selection ............................................................................ 2–7 2.6 RF Connections ................................................................................................. 2–9 2.7 Audio Input Connections ................................................................................. 2–10 2.8 SCA Input Connections ................................................................................... 2–11 2.9 Composite Input Connection ........................................................................... 2–11 2.10 Audio Monitor Connections ............................................................................. 2–12 2.11 Pre-emphasis Selection ................................................................................... 2–12 2.12 Processor Bypass Option ................................................................................ 2–12 2.13 Program Input Fault Time-out ......................................................................... 2–13 2.14 Remote I/O Connector ..................................................................................... 2–13 iii Section 3—Operation ................................................. 3–1 3.1 Initial Power-up Procedures .............................................................................. 3–2 3.2 Power Switches................................................................................................. 3–4 3.2.1 DC Breaker .................................................................................................... 3–4 3.2.2 Power Switch ................................................................................................ 3–4 3.2.3 Carrier Switch ............................................................................................... 3–4 3.3 Front Panel Bar-Dot Displays ............................................................................. 3–5 3.3.1 Audio Processor Input .................................................................................. 3–5 3.3.2 Highband and Wideband Display .................................................................. 3–5 3.3.3 Modulation Display ....................................................................................... 3–5 3.5 Processing Control ............................................................................................ 3–6 3.6 Stereo-Mono Switch .......................................................................................... 3–6 3.4 Input Gain Switches .......................................................................................... 3–6 3.7 RF Output Control ............................................................................................. 3–7 3.8 Digital Multimeter .............................................................................................. 3–7 3.9 Fault Indicators ................................................................................................. 3–8 Section 4—Principles of Operation................................. 4–1 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.15 iv Part Numbering ................................................................................................. 4–2 Audio Processor Circuit Board .......................................................................... 4–3 Stereo Generator Circuit Board .......................................................................... 4–4 RF Exciter Circuit Board .................................................................................... 4–6 Metering Circuit Board ...................................................................................... 4–8 Motherboard ..................................................................................................... 4–9 Display Circuit Board ....................................................................................... 4–10 Voltage Regulator Circuit Board ...................................................................... 4–11 Power Regulator Circuit Boards ...................................................................... 4–12 RF Driver ......................................................................................................... 4–12 RF Amplifier .................................................................................................... 4–13 Chassis ........................................................................................................... 4–13 RF Output Filter & Reflectometer ..................................................................... 4–14 Receiver Circuit Board Option ......................................................................... 4–14 Section 5—Adjustments and Tests ................................. 5–1 5.1 Audio Processor Adjustments ........................................................................... 5–2 5.1.1 Pre-Emphasis Selection ................................................................................ 5–2 5.1.2 Pre-Emphasis Fine Adjustment ..................................................................... 5–2 5.2 Stereo Generator Adjustments .......................................................................... 5–3 5.2.1 Separation .................................................................................................... 5–3 5.2.2 Composite Output ......................................................................................... 5–3 5.2.3 19 kHz Level ................................................................................................. 5–3 5.2.4 19 kHz Phase ................................................................................................ 5–3 5.3 Frequency Synthesizer Adjustments .................................................................. 5–4 5.3.1 Frequency (Channel) Selection ...................................................................... 5–4 5.3.2 Modulation Compensator .............................................................................. 5–4 5.3.3 Frequency Measurement and Adjustment ..................................................... 5–4 5.3.4 FSK Balance Control ..................................................................................... 5–4 5.4 Metering Board Adjustments ............................................................................. 5–5 5.4.1 Power Calibrate ............................................................................................. 5–5 5.4.2 Power Set ..................................................................................................... 5–5 5.4.3 SWR Calibrate ............................................................................................... 5–5 5.4.4 PA Current Limit ........................................................................................... 5–5 5.5 Motherboard Adjustments ................................................................................. 5–6 5.6 Display Modulation Calibration .......................................................................... 5–6 5.7 Voltage Regulator Adjustments ......................................................................... 5–6 5.8 Bias Set (RF Power Amplifier) ........................................................................... 5–6 5.9 Performance Verification ................................................................................... 5–7 5.9.1 Audio Proof-of-Performance Measurements ................................................. 5–7 5.9.2 De-emphasis Input Network .......................................................................... 5–7 5.10 Carrier Frequency .............................................................................................. 5–8 5.11 Output Power .................................................................................................... 5–8 5.12 RF Bandwidth and RF Harmonics ...................................................................... 5–8 5.13 Pilot Frequency ................................................................................................. 5–8 5.14 Audio Frequency Response ............................................................................... 5–9 5.15 Audio Distortion ................................................................................................ 5–9 5.16 Modulation Percentage ...................................................................................... 5–9 5.17 FM and AM Noise .............................................................................................. 5–9 5.18 Stereo Separation .............................................................................................. 5–9 5.19 Crosstalk ........................................................................................................... 5–9 5.19.1 Main Channel Into Sub .............................................................................. 5–10 5.19.2 Sub Channel Into Main .............................................................................. 5–10 5.20 38 kHz Subcarrier Suppression ....................................................................... 5–10 5.21 Additional Checks ............................................................................................ 5–10 v Section 6—Reference Drawings .................................... 6–1 6.1 Views ................................................................................................................ 6–2 6.2 Board Layouts and Schematics ......................................................................... 6–4 Section 7—Service and Support .................................... 7–1 7.1 Service .............................................................................................................. 7–2 7.2 24–Hour Support .............................................................................................. 7–2 7.3 Spare Parts ....................................................................................................... 7–2 Appendix ................................................................ A–1 Glossary ................................................................. G–1 Index................................................................ Index–1 I INFORMATION Section 1—Getting Acquainted This section provides a general description of the FM500 transmitter and introduces you to safety conventions used within this document. Review this material before installing or operating the transmitter. Getting Acquainted 1–1 I 1.1 Your Transmitter The FM500 is a member of a family of FM stereo broadcast transmitters. Crown transmitters are known for their modularity, ease-of-use, and reliability. The modularity is most apparent in the standard transmitter configuration which incorporates audio processing, stereo generation, and RF amplification without compromised signal quality. A single Crown transmitter can replace several pieces of equipment in a traditional system. Ease-of-use is apparent in the user-friendly front panel interface and in the installation procedure. Simply select your operating frequency (using four rotary switches), add an audio source, attach an antenna, connect AC power, and you're ready to broadcast. Of course, the FM series of transmitters also feature more sophisticated inputs and monitoring connections if needed. Reliability is a Crown tradition. The first Crown transmitters were designed for rigors of worldwide and potentially portable use. The modular design, quality components, engineering approach, and high production standards ensure stable performance. Remote control and metering of the transmitter is made possible through a builtin I/O port. For more direct monitoring, the front panel includes a digital multimeter display and status indicators. Automatic control circuitry provides protection for high VSWR as well as high current, voltage, and temperature conditions. 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing ® RF Output Pilot FM500 FM BROADCAST TRANSMITTER Illustration 1–1 FM500 Stereo Broadcast Transmitter 1–2 FM500 User's Manual 1.2 Applications and Options Crown transmitters are designed for versatility in applications. They have been used as stand-alone and backup transmitters and in booster, translator, and satellator applications. The following discussion describes these applications further. Model numbers describe the configuration of the product (which has to do with its intended purpose) and the RF output power which you can expect. The number portion of each name represents the maximum RF output power. The FM500, for example, can generate up to 500 watts of RF output power. Suffix letters describe the configuration. The FM500T, for example, designates a "transmitter" configuration. Since this is standard, it is what is described in the manual except where specified. In this configuration, the product includes the following modules (functions): ❑ audio processor ❑ stereo generator ❑ RF exciter ❑ metering ❑ low-pass filter RF Exciter Stereo Generator Low-pass Filter Metering Audio Processor 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Pilot Input Gain Mono Processing ® RF Output FM500 FM BROADCAST TRANSMITTER Illustration 1–2 Standard (Transmitter) Configuration Getting Acquainted 1–3 I 1.2.1 Stand-Alone In the standard configuration, the FM500 is an ideal stand-alone transmitter. When you add an audio source (monaural, L/R stereo, or composite signal), an antenna, and AC power, the transmitter becomes a complete FM stereo broadcast station, capable of serving a community. As stand-alone transmitters, Crown units often replace multiple pieces of equipment in a traditional setup (exciter, audio processor, RF amplifier). 1.2.2 Backup In the standard configuration, Crown transmitters are also used in backup applications. Should your primary transmitter become disabled, you can continue to broadcast while repairs take place. In addition, the FM transmitters can replace disabled portions of your existing system including the exciter, audio processor, or amplifier. Transfer switches on each side of the existing and backup transmitters make the change-over possible with minimal downtime. 1.2.3 Booster Also in the standard configuration, Crown transmitters have been used as booster transmitters. Booster applications typically involve certain geographic factors which prevent your system from broadcasting to the full coverage area allowable. For example, a mountain range might block your signal to a portion of your coverage area. Careful placement of a Crown transmitter, operating on the same frequency as your primary transmitter, can help you reach full coverage. 1.2.4 Exciter In addition to the standard configuration, the FM500 is available in optional configurations to meet a variety of needs. An "E" suffix, as in the FM500E, for example, represents an exciter-only configuration. In this configuration, the audio processor and stereo generator are not included. The exciter configurations are the least expensive way to get Crownquality components into your transmission system. You might consider the Crown exciter when other portions of your system are performing satisfactorily and you want to maximize your investment in present equipment. 1–4 FM500 User's Manual 1.2.5 Translator A receiver configuration (FM500R, for example) takes an exciter configuration and adds receiver circuitry as well. This added feature makes the FM500 ideal for translator service in terrestrial-fed networks. These networks represent a popular and effective way to increase your broadcasting coverage. Translators, acting as repeater emitters, are necessary links in this chain of events. Traditionally, network engineers have relied on multiple steps and multiple pieces of equipment to accomplish the task. Others have integrated the translator function (receiver and exciter) to feed an amplifier. Crown, on the other hand, starts with an integrated transmitter and adds a solid-state Receiver Module to form the ideal translator. RF IN Receiver Module (option) Stereo Generator Low-pass Filter RF Out RF Exciter Metering 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing ® RF Output Pilot FM500 FM BROADCAST TRANSMITTER Illustration 1–3 Crown's Integrated Translator This option enables RF in and RF out on any of Crown’s FM series of transmitters. In addition, the module supplies a composite output to the RF exciter portion of the transmitter. From here, the signal is brought to full power by the built-in power amplifier for retransmission. The Receiver Module has been specifically designed to handle SCA channel output up to 100 kHz for audio and high-speed data. FSK ID programming is built-in to ensure compliance with FCC regulations regarding the on-air identification of translators. Simply specify the call sign of the repeater station when ordering. Should you need to change the location of the translator, replacement FSK chips are available. The Receiver Module option should be ordered at the time of initial transmitter purchase. However, an option kit is available for field converting existing Crown units. Getting Acquainted 1–5 I 1.2.6 Satellator Another option is available for all configurations—an FSK Identifier (FSK IDer). This added feature enables the FM500 to transmit its call sign or operating frequency in Morse Code. This option is intended for use in satellite-fed networks. Transmitters equipped in this fashion are often known as "satellators." Connect the transmitter to your satellite receiver and the pre-programmed FSK IDer does the rest—shifting the frequency to comply with FCC requirements and in a manner that is unnoticeable to the listener. The FSK IDer module should be ordered at the time you order your transmitter but is available separately (factory programmed for your installation). Add the FSK IDer option to the exciter configuration for the most economical satellator (a composite input signal is required). Low-pass Filter RF Out FSK IDer (option) Stereo Generator Audio Processor RF Exciter Metering Modulation Fault Audio Input 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing ® RF Output Pilot FM500 FM BROADCAST TRANSMITTER Illustration 1–4 Transmitter with FSK IDer Option 1–6 FM500 User's Manual 1.3 Transmitter/Exciter Specifications Frequency Range 87 MHz–108 MHz (65 MHz–73 MHz optionally available) RF Power Output 100–550 watts (VSWR 1.5:1 or better) RF Output Impedance 50 Ω Frequency Stability Meets FCC specifications from 0-50 degrees C Audio Input Impedance 50 kΩ bridging, balanced, or 600 Ω Audio Input Level Selectable for –10 dBm to +10 dBm for 75 kHz deviation at 400 Hz Pre-emphasis Selectable for 25, 50, or 75 µsec; or Flat Audio Response Conforms to 75 µsec pre-emphasis curve as follows Complete transmitter ±0.30 dB (50 Hz–10 kHz) ±1.0 dB (10 kHz–15 kHz) Exciter only ±0.25 dB (50 Hz–15 kHz) Distortion (THD + Noise) Complete transmitter Less than 0.7% (at 15 kHz) Exciter only Less than 0.3% (50 Hz–15 kHz) Stereo Separation Complete transmitter Better than –40 dB (50 Hz–15 kHz) Exciter only Better than –40 dB (50 Hz–15 kHz) Crosstalk Main into sub, better than –40 dB Sub into main, better than –40 dB Stereo Pilot 19 kHz ±2 Hz, 9% modulation Subcarrier Suppresion 50 dB below ±75 kHz deviation FM S/N Ratio (FM noise) Complete transmitter Better than –60 dB Exciter only Better than –70 dB Getting Acquainted 1–7 I AM S/N Ratio Asynchronous and synchronous noise better than NAB recommendations RF Bandwidth ±120 kHz, better than –35 dB ±240 kHz, better than –45 dB RF Spurious Products Better than –70 dB Operating Environment Temperature (0–50o C) Humidity (0–80% at 20o C) Maximum Altitude (3,000 meters; 9843 feet) AC Power 100, 120, 220, or 240 volts (+10%/–15%); 50/60 Hz Regulatory Type notified for FCC parts 73 and 74; Meets FCC, DOC, and CCIR requirements Dimensions 17.8 x 41.9 x 44.5 cm (7.0 x 16.5 x 17.5 inches) Weight 1–8 29.5 kg (65 lbs); 31.8 kg (70 lbs) shipping weight FM500 User's Manual 1.4 Receiver Specifications Monaural Sensitivity (demodulated, de-emphasized) 3.5 µV for signal-to-noise > 50 dB 12.6 µV for signal-to-noise > 60 dB Stereo Sensitivity (19–kHz pilot frequency added) 2.8 µV for signal-to-noise > 40 dB 8 µV for signal-to-noise > 50 dB 31 µV for signal-to-noise > 60 dB Connector Standard type N, 50 Ω Shipping Weight 1 lb Getting Acquainted 1–9 I 1.5 Safety Considerations Crown Broadcast assumes the responsibility for providing you a safe product and safety guidelines during its use. “Safety” means protection to all individuals who install, operate, and service the transmitter as well as protection of the transmitter itself. To promote safety, we use standard hazard alert labeling on the product and in this manual. Follow the associated guidelines to avoid potential hazard. 1.5.1 Dangers DANGER represents the most severe hazard alert. Extreme bodily harm or death will occur if DANGER guidelines are not followed. 1.5.2 Warnings WARNING represents hazards which could result in severe injury or death. 1.5.3 Cautions CAUTION indicates potential personal injury or equipment or property damage if the associated guidelines are not followed. Particular cautions in this text also indicate unauthorized radio-frequency operation. Type of Hazard WARNING Severe shock hazard! Pictorial Indication of Hazard Turn power off and wait approximately 1 minute for capacitors to discharge before handling them. Explanation of Hazard Illustration 1–5 Sample Hazard Alert 1–10 FM500 User's Manual ® Section 2—Installation This section provides important guidelines for installing your transmitter. Review this information carefully for proper installation. Installation 2–1 CAUTION Possible equipment damage! Before operating the transmitter for the first time, check for the proper AC line voltage setting and frequency selection as described in sections 2.3 and 2.4. 2.1 Operating Environment You can install the FM transmitter in a standard component rack or on a suitable surface such as a bench or desk. In any case, the area should be as clean and wellventilated as possible. Always allow for at least 2 cm of clearance under the unit for ventilation. If you set the transmitter on a flat surface, install spacers on the bottom cover plate. If you install the transmitter in a rack, provide adequate clearance above and below. Do not locate the transmitter directly above a hot piece of equipment. 2.2 Remove PA Tray Spacers The Crown FM 500 is shipped with spacers between the PA tray and the transmitter back panel. The spacers prevent damage to internal contacts during shipping. Remove and save the spacers and screws before installing the FM500. #8 #8 #6 Illustration 2-1 FM 500 PA Tray Mounting Screws 1. Remove screws and spacers from five locations. 2. Firmly push the PA tray into the FM 500 until the PA tray panel touches the back panel. 3. Locate the bag labeled 500 Hardware. Install four #8 screws and washers and one number #6 screw and washer. See photo for locations. 2–2 FM500 User's Manual 2.3 Power Connections The FM500 operates on 100, 120, 220, or 240 volts AC (50 or 60 Hz; single phase). As shipped (factory default settings), the FM500 operates on 120 volts at 60 Hz. If you are operating the transmitter at 120 volts you do not need to make any changes. To operate the FM500 at 100, 220, or 240 volts, a few changes are necessary. To change the voltage setting, follow these steps: 1. Disconnect the power cord if it is attached. 2. To set the input voltage for 100 volts, skip to step 7. 3. Open the cover of the power connector assembly using a small, flat blade screwdriver. See Illustration 2–2. 4. Insert the screwdriver into the top slot of the voltage selection assembly (red) and pry out the assembly from the power connector. 5. If you are setting the input voltage for 220 or 240 volts, replace the installed fuses with 12 amp fuses (included in your package). See Illustration 2–3. 6. Replace the red fuse assembly so that the "230V" setting appears right side up in the window. Close the assembly window. 115V 115V 230V Illustration 2–2 Opening the Power Connector Cover Installation Illustration 2–3 Removing the Voltage Selection (red) Assembly 2–3 7. Turn the transmitter upside down and remove the bottom cover. Note: The front panel filter grill must be removed to expose all of the bottom Power Distribution Board front of transmitter Illustration 2–4 Underside of Transmitter—Bottom Cover Removed cover screws for bottom cover removal and installation. 8. Locate the power distribution circuit board on the left side next to the large transformer cover. See Illustration 2–4. 9. For 100 or 220 volt operation, change the jumper setting of P1 to the 100/ 220 V setting. 10. For 220 or 240 volt operation, • remove the jumper connecting P6 and P7. • remove the jumper connecting P4 and P5. • use a jumper to connect P5 and P6. 11. Replace the bottom cover, and the front grill. 12. Connect the AC power cord. For your reference, use 12 amp fuses for 220 or 240 volt operation and 20 amp fuses for 100 or 120 volt operation. 2–4 FM500 User's Manual 2.4 Frequency (Channel) Selection You may select an operating frequency of 87 to 108 MHz in the FM broadcast band with 100 kHz channel spacing (10 kHz spacing is optional with the addition of a fifth rotary selector switch). To adjust the operating frequency, follow these steps: 1. Remove the top cover by removing 15 screws. 2. Locate the RF Exciter board and identify the frequency selector switches which will be used to change the setting. See Illustrations 2–5 and 2–6. Modulation Trim-pot Frequency Selection Rotary Switches RF Exciter 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing RF Output Pilot FM500 ® FM BROADCAST TRANSMITTER Illustration 2–5 Top Cover Removed MEGAHERTZ .1 .01 Illustration 2–6 RF Exciter Board Frequency Selector Switches Installation 2–5 3. Use small flat blade screwdriver or another suitable device to rotate the switches to the desired setting. (The selected number will appear directly above the white indicator dot on each switch.) See examples of selected frequencies in the illustration below. = 88.1 MHz = 107.9 MHz Illustration 2–7 Two Sample Frequency Selections 4. If you have the receiver option, proceed to section 2.5 to set the incoming frequency. Otherwise, replace the top cover. 2.4.1 Modulation Compensator The Modulation trim-potentiometer (see illustration 2–8) compensates for slight variations in deviation sensitivity with frequency. Set the trim-pot dial according to the following graph: Modulation Compensation Pot Setting 90 80 70 60 50 40 30 20 10 0 75 80 85 90 95 100 105 110 Frequency (MHz) Illustration 2–8 Modulation Compensator Settings These compensator settings are approximate. Each mark on the potentiometer represents about 1.8% modulation compensation. For more exact settings, refer to section 5.2.2. 2–6 FM500 User's Manual 2.4.2 RF Tuning Adjustments All the RF stages are broadband to cover the 88 to 108 MHz broadcast band. The RF amplifier stages require no tuning. 2.5 Receiver Frequency Selection If you have a transmitter equipped with the receiver option, you will need to set the receiving or incoming frequency. 1. With the top cover removed, locate the receiver module and the two switches (labeled SW1 and SW2). 2. Use the table on the following pages to set the switches for the desired incoming frequency. 3. After setting the frequency, return to section 2.3.1 to set the modulation compensator. Frequency Selection Switches SW1 & SW2 RF IN Stereo Receiver Generator Module RF Exciter 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing ® RF Output Pilot FM500 FM BROADCAST TRANSMITTER Illustration 2–8 Receiver Module Switches Installation 2–7 Frequency SW1 SW2 Frequency SW1 SW2 Frequency SW1 SW2 Frequency SW1 SW2 87.9 88.0 88.1 88.2 88.3 88.4 88.5 88.6 88.7 88.8 88.9 89.0 89.1 89.2 89.3 89.4 89.5 89.6 89.7 89.8 89.9 90.0 90.1 90.2 90.3 90.4 90.5 90.6 90.7 90.8 90.9 91.0 91.1 91.2 91.3 91.4 91.5 91.6 91.7 91.8 91.9 92.0 92.1 92.2 92.3 92.4 92.5 92.6 92.7 92.8 92.9 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 0 8 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 93.0 93.1 93.2 93.3 93.4 93.5 93.6 93.7 93.8 93.9 94.0 94.1 94.2 94.3 94.4 94.5 94.6 94.7 94.8 94.9 95.0 95.1 95.2 95.3 95.4 95.5 95.6 95.7 95.8 95.9 96.0 96.1 96.2 96.3 96.4 96.5 96.6 96.7 96.8 96.9 97.0 97.1 97.2 97.3 97.4 97.5 97.6 97.7 97.8 97.9 9 1 9 1 9 1 9 1 9 1 9 1 9 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 3 B 3 B 3 9 A A B B C C D D E E F F 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 A A B B C C D D E E F F 0 0 1 1 2 98.0 98.1 98.2 98.3 98.4 98.5 98.6 98.7 98.8 98.9 99.0 99.1 99.2 99.3 99.4 99.5 99.6 99.7 99.8 99.9 100.0 100.1 100.2 100.3 100.4 100.5 100.6 100.7 100.8 100.9 101.0 101.1 101.2 101.3 101.4 101.5 101.6 101.7 101.8 101.9 102.0 102.1 102.2 102.3 102.4 102.5 102.6 102.7 102.8 102.9 B 3 B 3 B 3 B 3 B 3 B 3 B 3 B 3 B 3 B 3 B 3 B 3 B 3 B 4 C 4 C 4 C 4 C 4 C 4 C 4 C 4 C 4 C 4 C 4 C 4 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 A A B B C C D D E E F F 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 A A B 103.0 103.1 103.2 103.3 103.4 103.5 103.6 103.7 103.8 103.9 104.0 104.1 104.2 104.3 104.4 104.5 104.6 104.7 104.8 104.9 105.0 105.1 105.2 105.3 105.4 105.5 105.6 105.7 105.8 105.9 106.0 106.1 106.2 106.3 106.4 106.5 106.6 106.7 106.8 106.9 107.0 107.1 107.2 107.3 107.4 107.5 107.6 107.7 107.8 107.9 108.0 C 4 C 4 C 4 C 4 C 5 D 5 D 5 D 5 D 5 D 5 D 5 D 5 D 5 D 5 D 5 D 5 D 5 D 5 D 5 D 5 D 6 E 6 E 6 E 6 E 6 E B C C D D E E F F 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 A A B B C C D D E E F F 0 0 1 1 2 2 3 3 4 4 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 A A B B C C D D E E F F 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 Table 2–1 Receiver Frequency Selection 2–8 FM500 User's Manual 2.6 RF Connections Connect the RF load, an antenna or the input of an external power amplifier, to the type-N, RF output connector on the rear panel. VSWR should be 1.5:1 or better. WARNING Severe shock hazard! Do not touch the inner portion of the RF output connector when transmitter power is on. The RF monitor is intended primarily for a modulation monitor connection. Information gained through this connection can supplement that which is available on the transmitter front panel displays. If your transmitter is equipped with the receiver option, connect the incoming RF to the RF IN connector. RF Output Connector RFInput Connector (receiver option only) RF Output Monitor 115V Illustration 2–10 RF Connections Installation 2–9 2.7 Audio Input Connections Attach audio inputs to the Left and Right XLR connectors on the rear panel. (The Left channel audio is used on Mono.) Pin 1 of the XLR connector goes to chassis ground. Pins 2 and 3 represent a balanced differential input with an impedance of about 50 kΩ. They may be connected to balanced or unbalanced left and right program sources. The audio input cables should be shielded pairs, whether the source is balanced or unbalanced. For an unbalanced program source, one line (preferably the one connecting to pin 3) should be grounded to the shield at the source. Audio will then connect to the line going to pin 2. SCA IN RIGHT MONITOR COMPOSITE IN R LEFT/MONO L REMOTE I/O 1 2 3 Audio Inputs Illustration 2-10 XLR Audio Input Connectors By bringing the audio return line back to the program source, the balanced differential input of the transmitter is used to best advantage to minimize noise. This practice is especially helpful if the program lines are fairly long but is a good practice for any distance. If the program source requires a 600 Ω termination, install resistors on the 8–pin DIP socket on the motherboard (socket A501 located between the XLR connectors). See the motherboard schematic, on page 6–13. 2–10 FM500 User's Manual 2.8 SCA Input Connections You can connect external SCA generators to the SCA In connectors (BNC-type) on the rear panel. The inputs are intended for the 60 kHz to 99 kHz range, but a lower frequency may be used if the transmitter is operated in Mono mode. (The 23 to 53 kHz band is used for stereo transmission.) For 7.5 kHz deviation (10% modulation), input of approximately 3.5–volts (peak-to-peak) is required. SCA IN RIGHT MONITOR COMPOSITE IN R LEFT/MONO L REMOTE I/O 1 2 3 SCA Inputs (BNC) Connectors Illustration 2–12 SCA Input Connectors 2.9 Composite Input Connection To use the Crown transmitter as an RF Exciter only ("E" version or when using the "T" version with composite input), it is necessary to use the Composite Input section of the transmitter. This will feed composite stereo (or mono audio) directly to the RF exciter. In the "T" version, this will bypass the internal audio processor and stereo generator. See Section 2.12 on the next page for caution in using the bypass option. Input sensitivity is approximately 3.5–volt P-P for 75 kHz deviation. 1. Enable the Composite Input by grounding pin 9 of the Remote I/O connector (see Illustration 2–15). 2. Connect the composite signal using the Composite In BNC connector. Installation 2–11 SCA IN RIGHT MONITOR COMPOSITE IN R LEFT/MONO L REMOTE I/O 1 2 3 Composite Input (BNC) Connector Audio Monitor (RCA) Jacks Illustration 2–13 Composite In and Audio Monitor Connections 2.10 Audio Monitor Connections Processed, de-emphasized samples of the left and right audio inputs to the stereo generator are available at the Monitor jacks on the rear panel. The signals are suitable for feeding a studio monitor and for doing audio testing. De-emphasis is normally set for 75 µsec; set to 50 µsec by moving jumpers, JP203 and JP204, on the Stereo Generator board. 2.11 Pre-emphasis Selection Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appropriate pins of header JP1 on the audio processor board. If you change the pre-emphasis, change the de-emphasis jumpers JP203 and JP204 on the Stereo Generator board to match. 2.12 Processor Bypass Option You may bypass the audio processor in order to feed the left and right (preemphasized) audio directly to the stereo generator. The Normal-Bypass slide switch is near the left-rear corner of the motherboard. If the audio source is already processed and you do not desire further processing, use the Normal mode but turn the Processing control (on the front panel) to “0.” (See also section 3.5.) CAUTION In the BYPASS position, the pre-emphasis circuits and the filters that protect the pilot and stereo subcarrier are bypassed. As a result, the occupied bandwidth specifications of the transmitter could be compromised. The 15–Hz high-pass filters are also bypassed which may mean that modulation with frequencies below 10 Hz could cause the frequency synthesizer to unlock. 2–12 FM500 User's Manual 2.13 Program Input Fault Time-out You can enable an automatic turn-off of the carrier in the event of program failure. To enable this option, see the table on the next page. The time between program failure and carrier turn-off is set by a jumper (JP701) on the voltage regulator board (see Illustration 6–4 for board location). Jumper pins 1 and 2 (the two pins closest to the edge of the board) for a delay of approximately 30 seconds; pins 3 and 4 for a 2–minute delay; pins 5 and 6 for a 4–minute delay, and pins 7 and 8 for an 8–minute delay. 2.14 Remote I/O Connector Remote control and remote metering of the transmitter is made possible through a 15–pin, D-sub connector on the rear panel. (No connections are required for normal operation.) SCA IN RIGHT MONITOR COMPOSITE IN R LEFT/MONO L REMOTE I/O 1 2 3 Remote I/O Illustration 2–14 Remote I/O Connector The following table summarizes the Remote I/O pin connections. Installation 2–13 Pin Number Function 1 Ground 2 (no connection) 3 Composite Out (sample of stereo generator output) 4 FSK In (Normally high; pull low to shift carrier frequency approximately 7.5 kHz. Connect to open collector or relay contacts of user-supplied FSK keyer.) 5 /Auto Carrier Off (Pull low to enable automatic turnoff of carrier with program failure.) 6 Meter Battery (unregulated DC volts; 5 volts = 50 VDC) 7 Meter RF Watts (1 volt = 100 watts) 8 Meter PA Volts (5 volts = 50 VDC) 9 /Ext. Enable (Pull low to disable internal stereo generator and enable External Composite Input.) 10 a) 38 kHz Out (From stereo generator for power supply synchronization.) b) For transmitters equipped with tuner option, this pin becomes the right audio output for an 8–ohm monitor speaker. 38kHZ Out is disabled. 11 ALC 12 /Carrier Off (pull low to turn carrier off.) 13 Fault Summary (line goes high if any fault light is activated.) 14 Meter PA Temperature (5 volts = 100 degrees C.) 15 Meter PA Current (1 volt = 10 amperes DC.) Table 2–3 Remote I/O Connections 1 8 15 9 Illustration 2–15 Remote I/O Connector (outside view) 2–14 FM500 User's Manual Section 3—Operation This section provides general operating parameters of your transmitter and a detailed description of its front panel display. Operation 3–1 3.1 Initial Power-up Procedures These steps summarize the operating procedures you should use for the initial operation of the transmitter. More detailed information follows. CAUTION Possible equipment damage! Before operating the transmitter for the first time, check for the proper AC line voltage setting and frequency selection as described in sections 2.3 and 2.4. 1. Turn on the main power switch. Carrier Switch Modulation Fault SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 Carrier Power 50 Stereo 40 30 20 Mono RF Output Pilot FM500 FM BROADCAST TRANSMITTER Power Switch Illustration 3–1 Front Panel Power Switches 2. Verify the following: a. The bottom cooling fans runs continuously. b. The Lock Fault indicator flashes for approximately 5 seconds, then goes off. 4. Set the Input Gain switches for mid-scale wideband gain reduction on an average program level (see section 3.4). 5. Set the Processing control (see section 3.5; normal setting is “50”). 6. Set the Stereo-Mono switch to Stereo (see section 3.6). 7. Turn on the Carrier switch. 3–2 FM500 User's Manual 8. Check the following parameters on the front panel multimeter: a. RF Power should be 500–550 watts. b. SWR should be less than 1.25 (A reading greater than 1.25 indicates an antenna mismatch). c. ALC should be between 4.00 and 6.00 volts. d. PA DC Volts should be 46–56 volts. (Varies with antenna match, power, and frequency.) e. PA DC Amperes should be 12–16 amps. (Varies with antenna match, power, and frequency.) f. PA Temperature should initially read 20–35 degrees C (room temperature). After one hour the reading should be 35–50 degrees C. g. Supply DC Volts should display a typical reading of 65–70 V with the carrier on and 80–85 V with the carrier off h. Voltmeter should be reading 0.0. The remainder of this section describes the functions of the front panel indicators and switches. Operation 3–3 3.2 Power Switches 3.2.1 DC Breaker The DC breaker, on the rear panel, must be on (up) for transmitter operation, even when using AC power. Electrically, the DC breaker is located immediately after diodes which isolate the DC and AC power supplies. 3.2.2 Power Switch The main on/off power switch controls both the 120/240 VAC and the DC battery power input. 3.2.3 Carrier Switch This switch controls power to the RF amplifiers and supplies a logic high to the voltage regulator board, which enables the supply for the RF driver. In addition, the Carrier Switch controls the operating voltage needed by the switching power regulator. A "Lock Fault" or a low pin 12 (/Carrier Off) on the Remote I/O connector will hold the carrier off. (See section 2.12.) Carrier Switch Modulation Fault SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 Carrier Power 50 Stereo 40 30 20 Mono RF Output Pilot FM500 FM BROADCAST TRANSMITTER Power Switch Illustration 3–2 Front Panel Power Switches 3–4 FM500 User's Manual 3.3 Front Panel Bar-Dot Displays Bar-dot LEDs show audio input levels, wideband and highband audio gain control, and modulation percentage. Resolution for the gain control and modulation displays is increased over a conventional bar-graph display using dither enhancement which modulates the brightness of the LED to give the effect of a fade from dot to dot. (See section 4.7.) 3.3.1 Audio Processor Input Two vertical, moving-dot displays for the left and right channels indicate the relative audio levels, in 3 dB steps, at the input of the audio processor. Under normal operating conditions, the left and right Audio Processor indicators will be active, indicating the relative audio input level after the Input Gain switches. During program pauses, the red Low LED will light. With the receiver module option installed, the audio processor indicators are disabled. 3.3.2 Highband and Wideband Display During audio processing, the moving-dot displays indicate the amount of gain control for broadband (Wide) and pre-emphasized (High) audio. These indicators are disabled if the receiver module option is installed. As long as program material causes activity of the Wideband green indicators, determined by the program source level and Input Gain switches, the transmitter will be fully modulated. (See section 3.4.) The Wideband indicator shows short-term “syllabic-rate” expansion and gain reduction around a long-term (several seconds) average gain set. Program material and the setting of the Processing control determine the magnitude of the short-term expansion and compression (the rapid left and right movement of the green light). High-frequency program content affects the activity of the Highband indicator. With 75–µsec pre-emphasis, Highband processing begins at about 2 kHz and increases as the audio frequency increases. Some programs, especially speech, may show no activity while some music programs may show a great deal of activity. 3.3.3 Modulation Display A 10–segment, vertical peak-and-hold, bar graph displays the peak modulation percentage. A reading of “100” coincides with 75 kHz deviation. The display holds briefly (about 0.1 seconds) after the peak. The “Pilot” indicator illuminates when the transmitter is in the stereo mode. To verify the actual (or more precise) modulation percentage, connect a certified modulation monitor to the RF monitor jack on the rear panel. Operation 3–5 3.4 Input Gain Switches The “+6 dB” and “+12 dB” slide switches set audio input sensitivity according to the following table. Nominal Input Sensitivity +10 dBm +4 dBm -2 dBm -8 dBm Switches +6 dB +12 dB Down Down Up Down Down Up Up Up Table 3–1 Input Gain Switches Find, experimentally, the combination of Input Gain switch settings that will bring the Wideband gain-reduction indicator to mid scale for “normal” level program material. The audio processor will accommodate a fairly wide range of input levels with no degradation of audio quality. 3.5 Processing Control Two factors contribute to the setting of the Processing control: program material and personal taste. For most program material, a setting in the range of 40 to 70 provides good program density. For the classical music purist, who might prefer preservation of music dynamics over density, 10 to 40 is a good range. The audio will be heavily processed in the 70 to 100 range. If the program source is already well processed, as might be the case with a satellite feed, set the Processing to “0” or “10”. 3.6 Stereo-Mono Switch The Stereo-Mono slide switch selects the transmission mode. In Mono, feed audio only to the left channel. Although right-channel audio will not be heard as audio modulation, it will affect the audio processing. 3–6 FM500 User's Manual 3.7 RF Output Control Set this control for the desired output power level. Preferably, set the power with an external RF wattmeter connected in the coaxial line to the antenna. You may also use the RF power reading on the digital multimeter. The control sets the RF output voltage. Actual RF output power varies as the approximate square of the relative setting of the control. For example, a setting of “50” is approximately 1/4 full power. Operation below 100 watts is not recommended as instability can occur which could damage the transmitter. CAUTION Possible equipment damage! Operation below 100 watts can cause oscillations and other problems that could damage the transmitter. 3.8 Digital Multimeter The four-digit numeric display in the center of the front panel provides information on transmitter operation. Use the “Up” and “down” push-buttons to select one of the following parameters. A green LED indicates the one selected. Digital Multimeter Multimeter Functions Modulation Fault Audio Input 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Multimeter Push-buttons +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing RF Output ® Pilot FM500 FM BROADCAST TRANSMITTER Illustration 3–3 Digital Multimeter RF Power—Actually reads RF voltage squared, so the accuracy can be affected by VSWR (Voltage Standing-Wave Ratio). See section 5.4 for calibration. Requires calibration with the RF reflectometer being used. SWR—Direct reading of the antenna standing-wave ratio (the ratio of the desired load impedance, 50 ohms, to actual load). Operation 3–7 ALC—DC gain control bias used to regulate PA supply voltage. With the PA power supply at full output voltage, ALC will read about 6.0 volts. When the RF output is being regulated by the RF power control circuit, this voltage will be reduced, typically reading 4 to 5.5 volts. The ALC voltage will be reduced during PA DC overcurrent, SWR, or LOCK fault conditions. PA DC Volts—Supply voltage of the RF power amplifier. PA DC Amps—Transistor drain current for the RF power amplifier. PA DC Temperature—Temperature of the RF power amplifier heatsink in degrees C. Supply DC Volts—Unregulated DC voltage at the input of the voltage regulators. For battery operation, this reading is the battery voltage minus a diode drop. Voltmeter—Reads the voltage at a test point located on the front edge of the motherboard. A test lead connected to this point can be used for making voltage measurements in the transmitter. The test point is intended as a servicing aid; an alternative to an external test meter. Remember that the accuracy is only as good as the reference voltage used by the metering circuit. Servicing a fault affected by the reference affects the Voltmeter reading. The metering scale is 0 to 199.9 volts. 3.9 Fault Indicators Faults are indicated by a blinking red light as follows: SWR—Load VSWR exceeds 1.5:1. ALC voltage is reduced to limit the reflected RF power. Lock—Frequency synthesizer phase-lock loop is unlocked. This indicator normally blinks for about five seconds at power turn-on. Whenever this light is blinking, supply voltages will be inhibited for the RF driver stage as well as for the RF power amplifier. Input—The automatic carrier-off circuit is enabled (see sections 2.11 and 2.12) and the absence of a program input signal has exceeded the preset time. (The circuit treats white or pink noise as an absence of a program.) PA DC—Power supply current for the RF power output amplifier is at the preset limit. ALC voltage has been reduced, reducing the PA supply voltage to hold supply current to the preset limit. PA Temp—PA heatsink temperature has reached 80–85° C (178–185° F). At about 83° C (181°F), ALC voltage begins to decrease, reducing the PA supply voltage to prevent a further increase in temperature. By 85° C (185° F), the PA will be fully cut off. 3–8 FM500 User's Manual , erono due persone che ab ondo bian to m o ue s non ha la dispozion in q e do dice che farl no si o. e, u M e non c'e nulla nel mond ch fors o re che al e mo ia di dic ta ci insegna a se non p con la mati arla endo v ri re sc , erono due persone che ab ma ondo bian to m o ue s non ha la dispozion in q e do dice che o si farl o. , un e M e non c'e nulla nel mond fors o re che ch o a le d iam i dic se n la matita ci insegna a non do co parl n e v are scri ma n la matita ci insegna a non do co parl ve n are scri , erono due persone che ab ondo bian to m o non ha la dispozion e do dice che si farl no o. e, u M fors ma ue s in q se dic ma se dic ma iam v scri ch o che endo iam e non c'e nulla nel mond o re ta ci insegna a non p con la mati ch o che do co ve n scri n la matita ci insegna a non al e di arla re e non c'e nulla nel mond o re al e parl di are n la matita ci insegna a non do co parl ve n are scri , erono due persone che ab ondo bian to m o non ha la dispozion e do dice che si farl no o. e, u M che non c'e nulla nel mondo fors re a l o che m e ia di dic atita ci insegna a no se con la m n pa ndo e rl v a re scri ma ma ue s in q Section 4—Principles of Operation This section discusses the circuit principles upon which the transmitter functions. This information is not needed for day-today operation of the transmitter but may be useful for advanced users and service personnel. Principles of Operation 4–1 uesto mondo, in rqse, uno si dice fo diciamo che se scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con ma scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con a m scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con madiciamo che se scrivendo con ma 4.1 Part Numbering As this section refers to individual components, you should be familiar with the part numbering scheme used. Although parts on the various circuit boards and circuit board drawings may be marked with identical reference numbers, each component in the transmitter has a unique part reference number. The circuit boards and component placement drawings use designators such as “R1”, “R2”, and “C1.” These numbers represent only a portion of the full part numbers (as shown on the schematic). To find the full number, refer to the chart below. R401, for instance, is marked “R1” on the Metering board and on its component placement drawing. Circuit Name Part numbers Audio Processor 0-199 Stereo Generator 200’s RF Exciter/Synthesizer 300’s Metering/Protection 400’s Motherboard 500’s Display 600’s Voltage Regulator 700’s Power Regulator 800’s RF Predriver 900’s Chassis Wiring 1000's RF Power Amplifier 1100's RF Low-Pass Filter 1200's Illustration 4–1 Component Part Numbering 4–2 FM500 User's Manual 4.2 Audio Processor Circuit Board The audio processor board provides the audio control functions of a compressor, limiter, and expander. Illustration 6–5 and accompanying schematic may be useful to you during this discussion. Audio Processor 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing ® RF Output Pilot FM500 FM BROADCAST TRANSMITTER Illustration 4–2 Audio Processor Board This board also contains the pre-emphasis networks. Reference numbers are for the left channel. Where there is a right-channel counterpart, references are in parenthesis. One processor circuit, the eighth-order elliptical filter, is located on the stereo generator board. Audio input from the XLR connector on the rear panel of the transmitter goes to differential-input amplifier, U1A (U2A). Binary data on the +6 dB and +12 dB control lines sets the gain of inverting amplifier U1B (U2B). Analog switch, U3, selects one of four feedback points in 6 dB steps. The output of U1B (U2B) goes to an eighth-order, elliptical, switched-capacitor, low-pass, 15.2 kHz filter. The filter finds its home on the stereo generator board to take advantage of the ground plane and proximity to the 1.52 MHz clock. The circuit associated with U4B (U4A), along with R22/C8 (R58/C20), form third-order, low-pass filtering, attenuating audio products below 30 Hz. The output level of analog multiplier U5 (U6) is the product of the audio signal at pin 13 and the DC voltage difference between pins 7 and 9. At full gain (no gain reduction) this difference will be 10 volts DC. Principles of Operation 4–3 uesto mondo, in rqse, uno si dice fo diciamo che se scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con ma scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con a m scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con madiciamo che se scrivendo con ma When either the positive or negative peaks of the output of U5 (U6) exceeds the gain-reduction threshold, U13A generates DC bias, producing broadband gain reduction. Q5 is a precision-matched transistor pair. Q5 and U13B form a log converter, so that a given voltage change produces a given change in gain control dB of U5 (U6). The log conversion ensures uniform level-processing characteristics well beyond the 20 dB control range. The log conversion has an additional benefit; it allows a display of gain control on a linear scale with even distribution of dB. Q1 (Q2) is a recover/expansion gate with a threshold about 18 dB below the normal program level. The amount of short-term expansion and gain reduction is controlled by R650, located on the front panel display board. (See section 3.5.) Pre-emphasis, in microseconds, is the product of the capacitance of C10 (C22), multiplied by the gain of U8 (U9), times the value of R31 (R67). For a 75 µsecond pre-emphasis, the gain of U8 (U9) will be about 1.11. Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appropriate pins on header JP1. Use trim pot R29 (R65) to make fine adjustments to the pre-emphasis. (See section 5.1.) For highband processing, the peak output of U10B is detected and gain-reduction bias is generated, as with the broadband processor. The highband processing, however, shifts the pre-emphasis curve rather than affecting overall gain. Peak audio voltages are compared to a plus and minus 5 volt reference, U17 and U18. This same reference voltage is used by the stereo generator, metering, and display boards. For an explanation of on-board adjustments see section 5.1. 4.3 Stereo Generator Circuit Board The stereo generator board (see Illustration 4–3) generates a composite stereo signal from left and right-channel audio inputs. The component side of the board is mostly a ground plane. Once again, the eighth-order, 15.2 kHz, elliptical, low-pass filters (U201 and U202) are on this board, but belong to the audio processor. Illustration 6–6 and accompanying schematic complement this discussion. U207A and Y201 comprise a 7.6 MHz crystal oscillator from which the 19 kHz and 38 kHz subcarriers are digitally synthesized. U207F is a buffer. The 7.6 MHz is divided by 5 in U208A to provide 1.52 MHz at pin 6, used by filters U201 and U202. 3.8 MHz, 1.9 MHz, and 304 kHz are also derived from dividers in U208. Exclusive-OR gates, U210A and U210B, provide a stepped approximation of a 38 kHz sine wave—a scheme described in the CMOS Cookbook by Don Lancaster (Howard W. Sams &. Co., Inc., Indianapolis, IN, 1978). With the resistor ratios used, the synthesized sine wave has very little harmonic energy below the 7th harmonic. U210C and D generate the 19 kHz pilot subcarrier. U211 is a dual, switched-capacitor filter, configured as second-order, low-pass filters, 4–4 FM500 User's Manual Stereo Generator 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing RF Output ® Pilot FM500 FM BROADCAST TRANSMITTER Illustration 4–3 Stereo Generator Board each with a Q of 5. The 38 kHz and 19 kHz outputs of pins 1 and 20, respectively, are fairly pure sine waves. Harmonic distortion products are better than 66 dB down—THD of less than 0.05%. U212 is a precision, four-quadrant, analog multiplier. The output of U212 is the product of 38 kHz applied to the “X” input and the difference of left and right audio (L-R signal) applied to the “Y” input. The resulting output is a double sideband, suppressed carrier—the L-R subcarrier. The SCA subcarrier, the left, right, and left-minus-right subcarriers, and the 19 kHz pilot subcarrier are combined into the composite stereo signal by summing amplifier U206B. Analog switch U205, at the input of U206B, provides switching of left and right audio for stereo and mono modes. In the mono mode, right channel audio is disabled, and the left channel audio is increased from 45% modulation to 100%. MON L and MON R outputs go to the AF Monitor jacks on the rear panel. R208+R210 (R220+R222) and C207 (C211) comprise a 75 µsec de-emphasis network. Processed, de-emphasized (75 µsec) samples of the stereo generator input signals are used for a studio monitor and for audio testing. Option jumpers JP203 (JP204) allow you to select 50 µsec. VR201 and VR202 supply +6 volts and –6 volts, respectively. A 5 volt reference from the audio processor board supplies the subcarrier generators. For an explanation of on-board adjustments see section 5.2. Principles of Operation 4–5 uesto mondo, in rqse, uno si dice fo diciamo che se scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con ma scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con a m scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con madiciamo che se scrivendo con ma 4.4 RF Exciter Circuit Board This board is also known as the Frequency Synthesizer board. The entire component side of the board is a ground plane. Rotary switches along the front edge of the board establish the operating frequency. The VCO (voltage-controlled oscillator) circuitry is inside a shielded cover. Illustration 6–7 and accompanying schematic can be used as reference in this discussion. The following theory may apply to previous versions of the exciter board, but it is typical of the operation of the current board which has the latest technological improvements. VCO, VCO61, operates at the synthesizer output frequency of 87 MHz to 108 MHz. The frequency is controlled by voltage-variable capacitors DV71 and DV72. U7A and U7B form an active filter to supply clean DC to the drain of Q71. They also serve as a common-base RF amplifier for Q71. A71 and A1 are hybrid RF amplifiers to provide buffering and gain. A sample of the RF from the VCO goes to the input of A2. A2 amplifies the signal and feeds it back to the synthesizer IC, U6. This signal, available at pin 4 of U6, may be used with a high frequency receiver for deviation and frequency measurements. (See sections 5.2 and 5.3.) U6 is a phase-locked-loop frequency synthesizer IC. The 10.24 MHz from the crystal oscillator is used by U6, along with ICs U1 through U3 and the frequency selector switches, to generate the frequencies of the transmitter. RF Exciter 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing RF Output ® Pilot FM500 FM BROADCAST TRANSMITTER Illustration 4–4 RF Exciter Board 4–6 FM500 User's Manual U6 is programmed with the four or five rotary switches. The binary output of the 0.1 MHz switch programs the “A” counter directly. BCD data from the 100’s, tens, and units rotary switches is converted to binary data by U3 to set the “N” counter. An optional fifth digit rotary switch for 10kHz spacing is available. U5C is a differential amplifier and filter for the error signal. Audio that is out of phase with that appearing on the error voltage is introduced by U5A, allowing for greater loop bandwidth with less degradation of the low-frequency audio response. U5D is an integrator. U5B is a VCO input voltage clamp. DV71 and DV72 are hyper-abrupt varactor tuning diodes with a square-law capacitance vs DC voltage curve, giving a straight-line frequency vs voltage curve in a LC oscillator where the varactors are the dominant source of capacitance. Lock and unlock status signals are available at the outputs of U4E and U4F, respectively. Modulation is introduced to the VCO through R17 and R71 to R75. About 4.1 millivolts across R75 produces 75 kHz deviation. An FSK signal (used for automatic identification of FM repeaters) shifts the frequencies of the 10.24 MHz crystal reference and the VCO. With keying, diodes D9 and D10, are reverse biased, increasing the crystal reference frequency. At the same time, current through R72 increases the VCO frequency. See section 5.3.4. Principles of Operation 4–7 uesto mondo, in rqse, uno si dice fo diciamo che se scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con ma scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con a m scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con madiciamo che se scrivendo con ma 4.5 Metering Circuit Board The ALC and metering circuitry is on the metering board (see Illustration 4–4). This board processes information for the RF and DC metering, and produces ALC (RF level-control) bias. It also provides reference and input voltages for the digital panel meter, voltages for remote metering, fan control, and drive for the front-panel fault indicators. Illustration 6–8 and accompanying schematic complement this discussion. PA voltage and current come from a metering shunt on the power regulator board. The PAI input is a current proportional to PA current; R405 converts the current to voltage used for metering and control. A voltage divider from the PAV line is used for DC voltage metering. Metering 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing ® RF Output Pilot FM500 FM BROADCAST TRANSMITTER Illustration 4–5 Metering Board U406A, U406B, and U407A, with their respective diodes, are diode linearity correction circuits. Their DC inputs come from diode detectors in the RF reflectometer in the RF low-pass filter compartment. U407B, U407C, Q405, and Q406 are components of a DC squaring circuit. Since the DC output voltage of U407C is proportional to RF voltage squared, it is also proportional to RF power. U404C, U404A, U403A, and U404D are level sensors for RF power, reflected RF power, PA temperature, and external PA current, respectively. When either of these parameters exceeds the limits, the output of U404B will be forced low, reducing the ALC (RF level control) voltage, which, in turn, reduces the PA supply voltage. 4–8 FM500 User's Manual The DC voltage setpoint for U404A (reflected RF voltage) is one-fifth that of U404C (forward RF voltage). This ratio corresponds to an SWR of 1.5:1 [(1+.2)/(1–.2)=1.5]. The U405 inverters drive the front panel fault indicators. To get a direct reading of SWR, the reference input of the digital panel meter is fed from a voltage proportional to the forward-minus-reflected RF voltage, while forward-plus-reflected is fed to the digital panel meter input. The panel meter provides the divide function. U408 & U409 function as data selectors for digital panel meter input and reference voltages. Binary select data for U408 & U409 comes from the display board. The output voltage of U403D goes positive when the temperature exceeds about 35 degrees C (set by R426) providing proportional fan control. When the Carrier switch is off or the RF power is less than about 5 watts, the SWR automatically switches to a calibrate-check mode. U406C provides a voltage that simulates forward power, while Q403 shunts any residual DC from the reflectedpower source. The result is a simulation of a 1.0 to 1 SWR. (See section 5.4.) 4.6 Motherboard The motherboard is the large board in the upper chassis interconnecting the audio processor, stereo generator, RF exciter, and metering boards. The motherboard eliminates the need for a wiring harness, and provides input/output filtering, test points, and modular customization. Motherboard components are passive with the exception of the fan driver transistor, power FET Q501. With Normal-Bypass slide switch SW501, it is possible to bypass the audio processor, connecting the left and right audio inputs directly to the inputs of the stereo generator. CAUTION In the BYPASS position, the pre-emphasis circuits and the filters that protect the pilot and stereo subcarrier are bypassed. As a result, the occupied bandwidth specifications of the transmitter could be compromised. The 15–Hz high-pass filters are also bypassed which may mean that modulation with frequencies below 10 Hz could cause the frequency synthesizer to unlock. If the audio source is already processed, and further processing is not desired, use the Normal mode instead of Bypass and turn the Processing control on the front panel to “0”. If it is necessary to provide resistive terminations at the audio inputs (either lineto-line or line-to-ground), you may place resistors directly into the 8–pin DIP socket, A501, located between the XLR input connectors. See Illustration 6–9 and accompanying schematic for the socket pin-out. Principles of Operation 4–9 uesto mondo, in rqse, uno si dice fo diciamo che se scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con ma scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con a m scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con madiciamo che se scrivendo con ma 4.7 Display Circuit Board The front-panel LEDs, the numeric display, the slide switches, and the processing and RF level controls are mounted on the display circuit board. To access the component side of the board, remove the front panel by removing 12 screws. The board contains circuits for the digital panel meter, modulation peak detector, and LED display drivers, as well as indicators and switches mentioned above. Illustration 6–10 and accompanying schematic complement this discussion. Left and right audio from input stages of the audio processor board (just after the Input Gain attenuator) go to the L VU and R VU input on the display board. Peak rectifiers U601A and U601B drive the left and right Audio Input displays. The LED driver gives a 3 dB per step display. The lowest step of the display driver is not used; rather a red LOW indicator lights when audio is below the level of the second step. Transistors Q601 and Q602 divert current from the LOW LEDs when any other LED of the display is lit. Resolution of the linear displays, High Band, Wide Band, and Modulation, has been improved using dither enhancement. With dither, the brightness of the LED is controlled by proximity of the input voltage relative to its voltage threshold. The effect is a smooth transition from step to step as input voltage is changed. U606A, U606B, and associated components comprise the dither generator. Dither output is a triangular wave. Composite stereo (or mono) is full-wave detected by diodes D605 and D606. U607, U613, Q603, and Q604 are components of a peak sample-and-hold circuit. Oscillator, U609F, supplies a low-frequency square wave to the Fault indicators, causing them to flash on and off. Digital multimeter inputs are selected with push buttons located to the right of the multimeter menu. Signals from the push buttons are conditioned by U609A and U609B. U610 is an up/down counter. Binary input to U611 from U610 selects a green menu indicator light, and lights the appropriate decimal point on the numeric readout. The binary lines also go to analog data selectors on the ALC/ metering board. Processing control, R650, is part of the audio processor. (See section 4.2.) The DPM IN and DPM REF lines are analog and reference voltage inputs to digital multimeter IC U612. They originate from analog data selectors on the ALC/ metering board. 4–10 FM500 User's Manual 4.8 Voltage Regulator Circuit Board The voltage regulator board is the longer of two boards mounted under the chassis toward the front of the unit. It has switch-mode voltage regulators to provide +12, –12, and 24 volts. It also contains the program detection and automatic carrier control circuits. Illustration 6–11 and accompanying schematic complement this discussion. U703E and U703F convert a 38 kHz sine wave from the stereo generator into a synchronization pulse. In the transmitter, synchronization is not used, thus D709 is omitted. U704 and U705 form a 24 volt switching regulator running at about 35 kHz. U704 is used as a pulse-width modulator; U705 is a high-side driver for MOSFET switch Q701. Supply voltage for the two IC’s (approximately 15.5 volts) comes from linear regulator DZ702/Q705. Bootstrap voltage, provided by D710 and C714, allows the gate voltage of Q701 to swing about 15 volts above the source when Q701 is turned on. Current through the FET is sensed by R738 and R738A. If the voltage between pin 5 and 6 of U705 exceeds 0.23 volts on a current fault, drive to Q701 is turned off. Turn-off happens cycle by cycle. The speed of the turn-off is set by C713. U706 is a switching regulator for both +12 volts and –12 volts. It runs at about 52 kHz. Energy for –12 volts is taken from inductor L702 during the off portion of the switching cycle. The –12 volts tracks the +12 volts within a few tenths of a volt. There will be no –12 volts until current is drawn from the +12 volts. Q702, Q703, and Q704 form an active filter and switch, supplying DC voltage to the RF driver, when the Carrier switch is on. The program detection circuit is made up of U701 and U702. U701A and U701D and associated circuitry discriminate between normal program material and white noise (such as might be present from a studio-transmitter link during program failure) or silence. U701A and surrounding components form a band-pass filter with a Q of 3 tuned to about 5 kHz. U701D is a first-order low-pass filter. Red and green LEDs on the board indicate the presence or absence of program determined by the balance of the detected signals from the two filters. U702 and U701C form a count-down timer. The time between a program fault and shutdown is selected by jumpering pins on header JP701. For times, see section 5.7. The times are proportional to the value of R721 (that is, times can be doubled by doubling the value of R721). Principles of Operation 4–11 uesto mondo, in rqse, uno si dice fo diciamo che se scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con ma scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con a m scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con madiciamo che se scrivendo con ma 4.9 Power Regulator Circuit Boards The power regulator boards are the two boards mounted under the chassis on either side of a pair of 15,000 µf filter capacitors toward the front of the unit. Each board has the switch-mode voltage regulator for a RF power amplifier, and circuitry for PA supply current metering. Illustration 6–12 and accompanying schematic complement this discussion. Diode D804, in series with the battery input, together with the AC-supply diode bridge, provides diode OR-ing of the AC and DC supplies. U801 and U802 form a switching regulator running at about 35 kHz. U801 is used as a pulse-width modulator; U802 is a high-side driver for MOSFET switch Q801. Power for the two IC’s comes from the 24 volt supply voltage for the RF driver (available when the Carrier switch is on). The voltage is controlled at 16 volts by zener diode DZ801. Bootstrap voltage provided by D802 and C809 allows the gate voltage of Q801 to swing about 16 volts above the source when Q801 is turned on. Current through the FET is sensed by R812 and R812A. If the voltage from pin 5 to 6 of U802 exceeds 0.23 volts on a current fault, drive to Q801 is turned off. This happens on a cycle-by-cycle basis. The speed of the turnoff is set by C805. In the transmitter, synchronization is not used, thus D801 is omitted. U803 and Q802 are used in a circuit to convert the current that flows through metering shunt, R819, into a current source at the collector of Q803. Forty millivolts is developed across R819 for each amp of supply current (.04 ohms x 1 amp). Q803 is biased by U803 to produce the same voltage across R816. The collector current of Q803 is the same (minus base current) as that flowing through R822 resulting in 40 microamperes per amp of shunt current. R405 on the metering board converts Q803 collector current to 0.1 volt per amp of shunt current (.04 ma X 2.49 k). (See section 5.4.) 4.10 RF Driver The RF Driver module is mounted next to the heat sinks on the bottom of the RF Amplifier/Combiner sub chassis. The driver amplifies the approximate 20 milliwatts from the frequency synthesizer to about 15 watts to drive the RF power amplifiers. A CA2832 hybrid, high-gain, wideband amplifier, operating at about 20 volts, provides about one watt of drive to a single MRF137 MOSFET amplifier. The MRF137 stage operates from a supply voltage of approximately 15 to 16 volts. The circuit board has components for input and output coupling and for power supply filtering. 4–12 FM500 User's Manual 4.11 RF Amplifier The two RF power amplifier modules are mounted on a combiner board, heat sink, slide rail assembly which slides into the main chassis at the rear, and is fastened to the back panel with six screws. RF power, DC power, and control voltages enter the PA assembly through a 72–pin edge connector that it slides into at the front of the chassis. The amplifier is built around two Phillips BLF278, dual-power MOSFETs rated for 50 volts DC and a maximum power of about 300 watts. When biased for class B, the transistor has a power gain of 20 dB. (It is biased below class B in the transmitter.) Input transformer, T1111, is made up of two printed circuit boards. The four-turn primary board is separated from the one-turn secondary by a thin dielectric film. R1112–R1117 are for damping. Trim pot R1111 sets the bias. Output transformer, T1121, has a one-turn primary on top of the circuit board and a two-turn secondary underneath. Inductors L1121 and L1122 provide power line filtering. The amplifiers are surrounded by a 50 Ω impedance, input/output combiner board which takes the 15 watts input and divides it equally to each power amp. Then the output from each amplifier is combined to form a single output. 4.12 Chassis The AC power supply components, as well as the bridge rectifier and main filter capacitor are mounted on the chassis. Changing the jumpers on the AC distribution board (located beside the transformer assembly on the bottom of the transmitter), configures the power transformer for 100, 120, 220, or 240 VAC; see section 2.2 for switching and fuse information. The board also includes MOV voltage-surge suppressors and in-rush current limiters as well as a 12 volt power supply for the PA assembly cooling fans. The main energy-storage/filter capacitors are located between the two power regulator boards. The DC voltage across each capacitor will be 65 to 70 volts when the carrier is on. WARNING Shock hazard! Do not attempt to short the capacitor terminals. A bleeder resistor will discharge the capacitor in approximately one minute after shutdown. Principles of Operation 4–13 uesto mondo, in rqse, uno si dice fo diciamo che se scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con ma scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con a m scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con madiciamo che se scrivendo con ma 4.13 RF Output Filter & Reflectometer The RF low-pass filter/reflectometer are located beside the motherboard in the right-hand compartment on the top of the chassis. See Illustration 6–14 and accompanying schematic for more information. A ninth-order, elliptic, low-pass filter attenuates harmonics generated in the power amplifier. The capacitors for the filter are circuit board pads. The reflectometer uses printed circuit board traces for micro-strip transmission lines. Transmission line segments (with an impedance of about 82 ohms) on either side of a 50 ohm conductor provide sample voltages representative of the square root of forward and reverse power. DC voltages, representative of forward and reflected power, go through a bulkhead filter board to the motherboard, then to the metering board, where they are processed for power control, metering, and for SWR metering and protection. 4.15 Receiver Circuit Board Option This option allows the transmitter to be used as a translator. The receiver board receives terrestrially fed RF signal and converts it to composite audio which is then fed into the exciter board. Microprocessor controlled phase lock loop technology ensures the received frequency will not drift, and multiple IF stages ensure high adjacent channel rejection. Refer to illustrations 4–6, 6–16 and its schematic for the following discussion. The square shaped metal can located on the left side of the receiver board is the tuner module. The incoming RF signal enters through the BNC connector (top left corner) and is tuned through the tuner module. Input attenuation is possible with jumper J1 on the top left corner of the receiver board. Very strong signals can be attenuated 20 dB automatically by placing the jumper on the left two pins (“LO” position). An additional 20 dB attenuation is also available with the jumpers in the top left corner of the board. The frequencies are tuned by setting switches SW1 and SW2 (upper right corner). These two switches are read upon power up by the microprocessor (U4). The microprocessor then tunes the synthesizer IC SA1057 (U3) to the selected frequency. The switches frequency range is 87.9 Mhz at setting “00” to 107.9 Mhz at setting “64”. Other custom ranges are available. The synthesizer chip works on a phase lock loop system. It receives the frequency information from pin 6 of the tuner module, then goes through a FET buffer amplifier (Q2) on its way to synthesizer IC (U3). The synthesizer feeds back a DC voltage through two resistors to pin 4 of the tuner module. Different frequencies cause different tuning voltages to go to the tuner module to tune it on frequency. The frequency synthesizer locks on to the exact frequency needed and adjusts the DC voltage accordingly. The microprocessor tunes the frequencies of the synthesizer IC, but the DC tuning voltage is somewhat dependent on the tuner module. 4–14 FM500 User's Manual RF IN Receiver Module (option) Stereo Generator 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing ® RF Output Pilot FM500 FM BROADCAST TRANSMITTER Illustration 4–6 Receiver Board (optional) Generally, the voltage is around 0.5 volt DC for tuning 88.1 MHz, and from 5.5 to 6.5 volts DC for tuning 107.9 MHz. The 10.7 MHz IF frequency comes out of the tuner module on pin 5 and is coupled into the first filter FL1; passes through FL1 and into the IF decoder system of IC LM1865 (U1). The FL1 filter sets the bandwidth or everything outside of the bandwidth depending on the filter that is selected. It could be a bandwidth of 180 kHz where everything outside of that is filtered out depending on the filter characteristics. A second filter (F3) is available when the signal has a great amount of interference from an adjacent signal. In such a case, remove the jumper cap that is in the F3 position, then remove the ceramic filter that is in the F4 storage position and place it into the F3 position. Then the signal goes to a buffer gain stage at pin 1 of LM1865 (U1). From there the signal passes through F2, which is a second filter for further removal of unwanted products, and then it goes on to the IF of that chip. The quadrature coil L4 is tuned to 10.7 MHz as per calibration procedures. This results in a low distortion of around 0.2 to 0.3% on the audio. The audio, still a composite at this point, will come out of pin 15 of that IC (U1) and go to the first buffer U9. Then it goes through a compensation network R54 and C26, and on to the stereo decoder chip at pin 2 of U5. When a stereo signal is present, Led 1 illuminates which indicates that left and right audio is available. Then the stereo signals go to gain stages U6A and U6B and out to the RCA jacks on the back of the cabinet. These can be used for off-air monitoring of the audio signal. Incoming frequency can be monitored from the frequency monitor BNC jack on the back. The stereo buffer U9, stereo decoder U5, and gain stages U6A and U6B have no effect on the signal that goes through the transmitter. This section along with the composite signal coming out of pin 15 of LM1865 (U1) is totally separate from the transmitter section. Principles of Operation 4–15 uesto mondo, in rqse, uno si dice fo diciamo che se scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con ma scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con a m scrivendo con maquesto mondo, in se, uno si dice for diciamo che se scrivendo con madiciamo che se scrivendo con ma A muting circuit, consisting of C22, a 1N914 diode, R14, and varible resistor R15 mutes the output when a signal is too weak to be understood. The strength of the signal muted is determined by the adjustment of R15. Any signal below the setting of R15 is shorted to +VCC through C22 by the current drawn through R14 and the diode. The audio signal above this setting goes through C17 to the connector P3. The P3 connector block allows jumpering to either internal circuitry or to external signal processing such as advertisement injection or other forms of altering the signal. If the jumper is installed for internal circuitry, the signal will go through R39 to the input of U2A. This is a buffer that drives the R20 pot located on the top left hand corner of the board. R20 sets signal gain for 100% modulation if adjusted correctly with a full incoming 75 kHz deviation signal. Then the signal goes through R21, R22, and C20 which, along with adjustable pot R24 and C21, forms a compensation network with some phase shifting. This allows the best stereo separation possible by adjusting and compensating for differences in FM exciter boards. The signal is buffered through U2B and finally reaches the output connectors P1 and P2, and on to the transmit circuitry. The power supply is fairly straight forward. The incoming 12 volt supply goes to a 7809, 9 volt regulator (VR1) which supplies all 9–volt needs on the board. The 9 volts also supplies a 7805, 5 volt regulator (VR2) which supplies all 5–volt needs on the board. Plus and minus 12 volts from the motherboard is filtered and supplies various needs on the board. Finally there is a precision reference voltage supplied through R50 by U7 and U8. These two 2.5 volt reference shunts act very much like a very accurate zenor diode to provide precision 5 volts to the metering board. 4–16 FM500 User's Manual Section 5—Adjustments and Tests This section describes procedures for (1) advanced users who may be interested in customizing or optimizing the performance of the transmitter and (2) service personnel who want to return the transmitter to operational status following a maintenance procedure. Adjustments and Tests 5–1 5.1 Audio Processor Adjustments 5.1.1 Pre-Emphasis Selection Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appropriate pins of header JP1 on the audio processor board. (See section 2.9.) If you change the pre-emphasis, change the de-emphasis jumpers, JP203 and JP204 on the Stereo Generator board, to match. (See section 2.8.) 5.1.2 Pre-Emphasis Fine Adjustment Trim potentiometers, R29 and R65, (for left and right channels, respectively) provide for fine adjustment of the pre-emphasis. Set the potentiometers to bring the de-emphasized gain at 10 kHz equal to that of 400 Hz. (At the proper setting, 15.0 kHz will be down about 0.7 dB.) When making these adjustments, it is important that you keep signal levels below the processor gain-control threshold. A preferred method is to use a precision de-emphasis network in front of the audio input. Then, use the non-de-emphasized (flat) output from the FM modulation monitor for measurements. 5–2 FM500 User's Manual 5.2 Stereo Generator Adjustments 5.2.1 Separation Feed a 400 Hz sine wave into one channel for at least 70% modulation. Observe the classic single-channel composite stereo waveform at TP1 on the RF Exciter circuit board. Adjust the Separation control for a straight centerline. Since proper adjustment of this control coincides with best stereo separation, use an FM monitor to make or confirm the adjustment. 5.2.2 Composite Output Adjust the composite output with a modultion monitor following the steps below: 1. Set the Stereo-Mono switch to Mono. 2. Check that the setting of the Modulation compensation control, R17 on the RF Exciter circuit board, falls within the range specified for the frequency of operation. (See section 2.3.1.) 3. Feed a sine wave signal of about 2.5 kHz into the left channel at a level sufficient to put the wideband gain-reduction indicator somewhere in the middle of its range. 4. Set the Composite level control to produce 90% modulation as indicated on an FM monitor. 5. Apply pink noise or program material to the audio inputs and confirm, on both Mono and Stereo, that modulation peaks are between 95% and 100%. 5.2.3 19 kHz Level Adjust the 19 kHz pilot for 9% modulation as indicated on an FM modulation monitor. (The composite output should be set first, since it follows the 19 kHz Level control.) 5.2.4 19 kHz Phase 1. Apply a 400 Hz audio signal to the left channel for at least 70% modulation. 2. Look at the composite stereo signal at TP301 on the RF Exciter circuit board with an oscilloscope, expanding the display to view the 19 kHz component on the horizontal centerline. 3. Switch the audio to the right-channel input. When the 19 kHz Phase is properly adjusted, the amplitude of the 19 kHz will remain constant when switching between left and right. 4. Recheck the separation adjustment as described in section 5.2.1. Adjustments and Tests 5–3 5.3 Frequency Synthesizer Adjustments 5.3.1 Frequency (Channel) Selection Refer to section 2.3. 5.3.2 Modulation Compensator Refer to section 2.3. 5.3.3 Frequency Measurement and Adjustment Next to the 10.24–MHz crystal on the RF Exciter board is a 1–11 pF piston trimmer capacitor (C3). Use C3 to set the frequency of the 10.24–MHz crystal while observing the output frequency of the synthesizer. Use one of these methods for checking frequency: ❑ Use an FM frequency monitor. ❑ Couple a frequency counter of known accuracy to the output of the synthesizer and observe the operating frequency. (Do not connect to the 10.24–MHz clock circuit.) 5.3.4 FSK Balance Control An FSK signal (used for automatic identification of FM repeaters) shifts the frequencies of the 10.24–MHz crystal reference oscillator and the VCO. Use an oscilloscope to observe the cathode end of D4. With no program, the pulse will be less than 1 µsec wide. With an FSK input (a 20–Hz square wave at the FSK input will work), set trim pot R45 for minimum pulse width. The setting will vary slightly with operating frequency. 5–4 FM500 User's Manual 5.4 Metering Board Adjustments 5.4.1 Power Calibrate While looking at RF Power on the digital panel meter, set the Power Calibrate trim potentiometer to agree with an external RF power meter. 5.4.2 Power Set With the front panel RF Output control fully clockwise, adjust the Power Set trim pot to 10% more than the rated power (33 W for FM30, 110 W for FM100, 275 W for FM250, 550 W for FM500) as indicated on an accurate external watt meter. If the authorized power is less than the maximum watts, you may use the Power Set to limit the range of the RF Output control. Operation below 100 watts is not recommended as instability can occur which could damage the transmitter. CAUTION Possible equipment damage! Operation below 100 watts can cause oscillations and other problems that could damage the transmitter. 5.4.3 SWR Calibrate When the Carrier switch is off, or the RF power is less than about 5 watts, the SWR circuit automatically switches to a calibrate-check mode. (See section 4.5 for more information.) Set the digital panel meter to read SWR. With the Carrier switch off, set the SWR CAL trim pot to read 1.03. 5.4.4 PA Current Limit Since it may not be practical to increase the PA current to set the PA Current Limit control, you may use this indirect method. With the carrier turned off, look at the DC voltage at the right end of R413 on the Metering board. The current limit, in amperes, will be 0.35 amps higher than ten times this voltage. Set the current limit for 16.5 amps or 1.615 volts at R413. Adjustments and Tests 5–5 5.5 Motherboard Adjustments For Normal-Bypass switch setting, see section 2.10. 5.6 Display Modulation Calibration The Modulation Calibrate trim pot sets the sensitivity of the front panel Modulation bar graph display. This adjustment may be made only after the Output trim pot on the Stereo Generator board has been set. (See section 5.2.4.) 1. Set the Stereo-Mono switch to Mono. 2. Feed a sine wave source of about 2.5 kHz into the left channel at a level sufficient to put the wideband gain-reduction indicator somewhere in the middle of its range. 3. Set the Modulation Calibrate trim pot so that the “90” light on the front panel Modulation display just begins to light. 5.7 Voltage Regulator Adjustments JP701, a 10–pin header on the Voltage Regulator board, sets the time between program failure and carrier turnoff. Pins 1 and 2 are the two pins closest to the edge of the board. The times are approximate. Sections 2.11, 2.12, and 4.8 contain further information. 1. Short pins 1 and 2 for a 30–second delay. 2. Short pins 3 and 4 for a 2–minute delay. 3. Short pins 5 and 6 for a 4–minute delay. 4. Short pins 7 and 8 for an 8–minute delay. You may select other times by changing the value of R721. The time is proportional to the resistance. 5.8 Bias Set (RF Power Amplifier) The Bias Set trim pot is located on the PA module on the input circuit board. Set the trim pot to its midpoint for near-optimum bias. 5–6 FM500 User's Manual 5.9 Performance Verification Measure the following parameters to receive a comprehensive characterization of transmitter performance: ❑ Carrier frequency ❑ RF output power ❑ RF bandwidth and RF harmonics (see section 5.12) ❑ Pilot frequency, phase, and modulation percentage ❑ Audio frequency response ❑ Audio distortion ❑ Modulation percentage ❑ FM and AM noise ❑ Stereo separation between left and right ❑ Crosstalk between main channel and subcarrier ❑ 38–kHz subcarrier suppression In addition to the above tests, which pertain to signal quality, a complete check of the unit will include items listed in section 5.21. 5.9.1 Audio Proof-of-Performance Measurements References to “100%” modulation assume 9% pilot and 91% for the remainder of the composite stereo signal. Because the audio processing threshold is at 90% modulation, it is not possible to make audio proof-of-performance measurements at 100% modulation through the audio processor. Instead, audio data for 100% modulation is taken from the input of the stereo generator (SW501 on Motherboard set for Bypass). Then, data, including the audio processor (SW501 set for Normal), is taken at a level below the audio processing threshold. 5.9.2 De-emphasis Input Network A precision de-emphasis network, connected between the test oscillator and the audio input of the transmitter, can be very helpful when making the audio measurements. Note that the input impedance of the transmitter or the source impedance of the test oscillator can affect network accuracy. With the de-emphasis network, oscillator level adjustments need only accommodate gain errors, instead of the whole pre-emphasis curve. Adjustments and Tests 5–7 5.10 Carrier Frequency Carrier frequency is measured at the output frequency with a frequency monitor or suitable frequency counter. To adjust frequency, see section 5.3.3. (FCC tolerance +/– 2000 Hz per FCC Part 73.1540 and 73.1545.) 5.11 Output Power The output power reading on the front panel display should be 90–105% of the actual value. For a more precise measurement, use a watt meter in the RF output line. See sections 5.4.1 and 5.4.2 for setting power. 5.12 RF Bandwidth and RF Harmonics You can observe RF bandwidth and spurious emissions with an RF spectrum analyzer. In the Stereo mode, feed a 15.0 kHz audio signal into one channel to provide 85% modulation as indicated on a monitor. Doing so produces 38% main, 38% stereo subcarrier, and 9% pilot per FCC Part 2.989. As an alternative, use pink noise into one channel. Using a spectrum analyzer, verify the following (per FCC 73.317): 1. Emissions more than 600 kHz from the carrier are at least 43 + 10log(power, in watts) dB down (70 dB for 500 watts). The scan should include the tenth harmonic. 2. Emissions between 240 kHz and 600 kHz from the carrier are down at least 35 dB. 3. Emissions between 120 kHz and 240 kHz from the carrier are down at least 25 dB. 5.13 Pilot Frequency The pilot frequency should be within 2 Hz of 19 kHz. (FCC Part 73.322.) Using a frequency counter, measure 1.9 MHz at pin 1 of U209 on the Stereo Generator board. A 200-Hz error here corresponds to a 2-Hz error at 19 kHz. If the frequency is off by more than 50 Hz, you may change the value of C213. (Changing C213 from 56 pF to 68 pF lowers the 1.9 MHz by about 35 Hz.) 5–8 FM500 User's Manual 5.14 Audio Frequency Response For the response tests, take the readings from an FM modulation monitor. Make audio frequency response measurements for left and right channels at frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2. 5.15 Audio Distortion Make distortion measurements from the de-emphasized output of an FM modulation monitor. Make audio distortion measurements for left and right channels at frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2. 5.16 Modulation Percentage While feeding an audio signal into the left channel only, confirm that the total modulation percentage remains constant when switching between Mono and Stereo. Measure modulation percentage with an FM modulation monitor, or by using an HF receiver and Bessel nulls. See section 5.2.2. 19–kHz pilot modulation should be 9%. 5.17 FM and AM Noise Take noise readings from a de-emphasized output of a modulation monitor. 5.18 Stereo Separation Make left-into-right and right-into-left stereo separation measurements with an FM modulation monitor for frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. 5.19 Crosstalk For stereo crosstalk measurements, both left and right channels are fed at the same time. For best results, there needs to be a means of correcting small imbalances in levels and phase. The balance is made at 400 Hz. Adjustments and Tests 5–9 5.19.1 Main Channel Into Sub Feed the left and right channels in phase with audio (L+R) at 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz at 100% modulation, while observing the stereo subcarrier (L-R) level on an FM modulation monitor. 5.19.2 Sub Channel Into Main Feed the audio into the left and right channel as above, with the exception of reversing the polarity of the audio of one channel (L-R input). Using the frequencies of 5.19.1 above, observe the main channel (L+R) level with a modulation monitor. 5.20 38 kHz Subcarrier Suppression With no modulation, but in the Stereo mode, the 38 kHz subcarrier, as indicated on an FM modulation monitor, should be down at least 40 dB. 5.21 Additional Checks In addition to the tests and adjustments mentioned in this section, the following checks ensure a complete performance appraisal of the transmitter: 1. Perform a physical inspection, looking for visible damage and checking that the chassis hardware and circuit boards are secure. 2. Check the functionality of switches and processing control. 3. Verify that all indicators function. 4. Check the frequency synthesizer lock at 80 MHz and 110 MHz. 5. Measure the AC line current with and without the carrier on. 6. Perform a functional test of the SCA input, Monitor outputs, and the monitor and control function at the 15–pin, D-sub connector. 7. Test the functionality of the FSK circuit. 8. Check the operation and timing of the automatic carrier-off circuitry associated with program failure. 9. Check all metering functions. 10. Test ALC action with PA current overload, SWR, and PLL lock. NOTE: FCC type acceptance procedures call for testing the carrier frequency over the temperature range of 0–50 degrees centigrade, and at line voltages from 85% to 115% of rating. (See FCC Part 2.995.) 5–10 FM500 User's Manual Section 6—Reference Drawings The illustrations in this section may be useful for making adjustments, taking measurements, troubleshooting, or understanding the circuitry of your transmitter. Reference Drawings 6–1 6.1 Views Gain Reduction/Expansion Indicators Digital Multimeter Modulation Fault Audio Input 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature +6 dB +12 dB Carrier Switch Carrier Power 50 Stereo Supply DC Volts -12 Modulation Indicators Multimeter Select 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing Pilot RF Output FM500 ® FM BROADCAST TRANSMITTER Audio Processor Processing Control Input Level Indicators Input Gain Stereo/Mono Switch Switches Fault Indicators Power Switch Relative RF Voltage Out Illustration 6–1 Front View RF Output RF Output Monitor Composite Input Ground SCA IN Audio Monitors MONITOR COMPOSITE IN R Audio Inputs RIGHT LEFT/MONO L REMOTE I/O 1 2 3 FUSE Power Amplifier and Cooling AC Power In SCA Inputs Remote I/O Illustration 6–2 Rear View 6–2 FM500 User's Manual RF Exciter Stereo Generator Low-pass Filter Metering Audio Processor 10 2 High Band RF Power High Expand 2 Compress SWR 20 ALC PA DC Volts Wide Band PA DC Amps -6 SWR Over Lock 100 Input 90 PA DC 80 PA Temp 70 60 PA Temperature Supply DC Volts -12 Modulation Fault Audio Input +6 dB +12 dB Carrier Power 50 Stereo 40 Voltmeter 30 -18 20 Low Input Gain Mono Processing RF Output Pilot FM500 ® FM BROADCAST TRANSMITTER Illustration 6–3 Chassis Top View Power Amp Fans Power Transformer Voltage Regulator Board Power Distribution Board Power Regulator Boards Filter Capacitors front of transmitter Illustration 6–4 Chassis Bottom View Reference Drawings 6–3 6.2 Board Layouts and Schematics Illustration 6–5 Audio Processor Board 6–4 FM500 User's Manual R9 1K L VU L IN1 R4 24.9K 1 C3 1.0 R2 1K R6 24.9K 1 +12V C1 100PF L IN2 R8 30.1K 1 C4 1.0 L LP2 7 5 X 3 Y 16 8 20K R IN1 C15 1.0 R40 1K R42 24.9K R IN2 C16 1.0 R41 1K 2 R43 24.9K 8 C18 .047 2 U4A TL072 1 3 7 4 3 7 9 4 1 C14 100PF R45 24.9K U2B TL072 R33 10K 2 U6 13 12 -12V 10 11 D8 R58 11.3K 1 3 PRE-EMP. R123 50K 11 3 R88 10M -5VDC at 0DB GR 4.1V at 20 DB GR 2 IN U17 4 GND C38 1.0 5 TRM +5V C46 0.1 R121 10.0K 1 R122 100 VSS -5V C39 1.0 8 7 6 5 8 C1 7 B2 6 E3 4 5 1 2 3 4 D13 8 2 C48 0.1 C41 1.0 2 4 6 8 10 12 14 16 18 20 J2 L LP1 L LP2 R LP1 R LP2 RECEPT 10X2 L OUT 10 8 6 4 2 RECEPT 5X2 9 7 5 3 1 R105 1M 8 R101 10K D16 2 1 3 U14A TL072 1K 4 R106 1K R76 10K C30 1.0 D15 D14 YEL 4 C35 1.0 D17 D18 560 TEST .25V/DB R99 Q3 R77 3.3K 2N5210 R107 10K -12V D21 -12V 3.3K -5V R111 49.9K 1 J3 R OUT 3mV/DB R100 120 D20 C25 100PF J1 1 3 5 7 9 11 13 15 17 19 8 7 6 5 C20A OPEN -12V L IN1 L IN2 R IN1 R IN2 1 C8 2 B7 3 E6 4 5 R93 10K R92 3 U13A TL072 C45 0.1 -12V C32 100PF R96 20.0K 1 1 2 3 4 R91 10M R75 2.4K C8A OPEN 2 4 6 8 +12V 3mV/DB R80 3.3K C43 0.1 1 3 5 7 R104 OPEN R97 49.9K 1 +12V 1 C44 0.1 C42 0.1 R103 3.3K C34 OPEN R95 20.0K 1 Q7 LM394 +12V C40 1.0 JP1 HEADER 4X2 FLAT 25uS 50uS 75uS 6 R82 120 +12V POT LOCATED ON DISPLAY PCB 4 R79 49.9K 1 -5V 5 U18B TL072 C33 .047 R94 20.0K 1 PROC C Q5 LM394 7 7 D12 R109 3.3K C26 100PF VEE C37 .01 6 SW1B 5 C47 0.1 R78 91K R118 10.0K 1 D11 C49 47PF R650 100K R86 3.3M C28 1.0 POLY -12V REF02 4 U18A TL072 4 LIGHT +5V VDD +5V R120 100 1 3 +5V +5.00V 8 3 6 VO U12A TL072 -12V PROC B R89 330K D19 8 2 -12V PROC A 10K C36 .01 +12V HEAVY R85 3.3K R83 +12V U10A 4 TL072 R68 12K R69 10K -5V C27 .047 R73 24.9K R72 24.9K 1 -12V C29 0.1 R87 3.3K SW1A 8 2 R90 1K TL072 1 R119 4.7K 3 1 -12V C50 47PF -5V 3 10 R66 49.9K 1 U7A +12V R81 1K 2 U9 Q2 2N5087 2 C22 .0027 POLY 1 13 12 R65 10K 8 3 R OUT R71 240K D10 7 9 R61 24.9K +12V R74 1K C23 220PF 14 AD632 R64 OPEN D7 C20 1.0 POLY C24 0.1 R70 24.9K +12V R62 100K R60 24.9K -12V R53 499 1 1 D6 D5 D9 2 2 U12B TL072 7 6 -12V R67 24.9K 4 -12V U10B TL072 5 (+/-5.0V PK) 5 U2A TL072 R37 24.9K +5V R52 499 1 6 5 R32 12K R59 100K 1 14 AD632 R50 2.0K 1 R47 30.1K 1 7 +12V 1 R51 1.0K 1 8 R30 49.9K 1 D4 R36 24.9K 6 10 3 L OUT R35 240K -5V R39 1K 2 11 7 R46 360K +12V C13 100PF R25 24.9K 1 1 U8 13 12 U7B TL072 R LP1 R44 24.9K R29 10K 5 R LP2 1 R28 OPEN Q1 2N5087 C10 .0027 POLY D3 R38 1K +12V C17 .047 1K 7 9 PRE-EMP. D1 C12 0.1 1 C11 220PF 1 4 AD632 6 R98 100 R VU R31 24.9K 1 +12V R26 100K R24 24.9K 1 -12V R49 R48 D2 R22 11.3K 1 3 R56 75K 1 74HC4052 /+12DB /+6DB R34 24.9K 10 R17 360K R16 499 1 1 5 2 4 6 10 9 Y0 Y1 Y2 Y3 INH A B 7 R11 47K R10 47K 12 14 15 11 X0 X1 X2 X3 +5V -5V U5 C8 1.0 POLY R15 499 1 U3 13 1 2 R14 1.0K 1 R12 20K 1 FLAT A=0 25uSEC A=0.33 50uSEC A=0.67 75uSEC A=1.0 (+/-5.0V PK) 11 C6 .047 R23 100K 1 13 12 5 R13 2.0K 1 -12V +5V 7 9 7 R1 100 +5V AD632 14 6 U1A TL072 4 GAIN: U5, Pin 2 to U8, Pin 2 (No Hi-band gain reduction) U4B TL072 L LP1 1 3 VOLTS P-P 1.1 3.5 11 +12V 2 R7 24.9K 1 C2 100PF R20 75K 1 C5 .047 6 8 R5 24.9K 1 R3 1K U1B TL072 GAIN REDUCTION THRESHOLD 10DB 20DB 1 3 5 7 9 11 13 15 17 19 21 23 25 2 4 6 8 10 12 14 16 18 20 22 24 26 RECEPT 13X2 +12V -12V /+6DB /+12DB L VU R VU +5.00V PROC A PROC B PROC C BR GR HI GR TEST R112 49.9K 1 C31 100PF R115 49.9K 1 +12V 8 2 6 7 6 1 5 U13B TL072 5 U15B TL072 R113 100 R84 49.9K 1 6 .25V / DB BR GR 8 6 7 5 U14B TL072 U15A TL072 1 -12V R110 49.9K 1 NOTES : 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% UNLESS OTHERWISE SPECIFIED. U16B TL072 R117 100 0.25V / DB HI GR 3 7 5 4 +12V 2 3 7 R116 49.9K 1 R102 49.9K 1 R114 49.9K 1 4 -12V U16A TL072 SCM, FM AUDIO PROCESSOR 103202 2. ALL CAPACITORS ARE IN MICROFARADS UNLESS OTHERWISE SPECIFIED. 3. ALL DIODES ARE 1N4148 UNLESS OTHERWISE SPECIFIED. AUDIO PROCESSOR Reference Drawings 6–5 Illustration 6–6 Stereo Generator Board 6–6 FM500 User's Manual +12V R54 24.9K 1% EXT RTN R55 24.9K C26 1.0 EXTERNAL COMPOSIT IN (3.5V P-P for 75KHz) EXT IN 8 2 R56 24.9K 1% 4 R57 24.9K C5 .0027 POLY 15.2 KHz LOW-PASS FILTER (8th ORDER ELLIPTICAL) 1 2 3 4 5 6 7 LPIN L +6V U1 3 R7 3.65K 1% -6V R1 330 R38 1M 2 8 R5 1K R12 10.0K 1% U3A TL072 1 3 C6 1030PF R9 2K 1% +12V 4 R6 499 1% LPOUT L C1 .0027 POLY C4 0 OHM +12V 2 14 13 12 11 10 9 8 D4 C3 100PF R3 0 OHM JP1 1 INPUT L LTC1064-1 D3 C27 1.0 -12V (3.5V P-P for 7.5KHz) SCA IN R58 3.9K 1 U6A TL072 3 -12V 2 R10 2.49K 1% R8 4.99K 1% 1 C9 .0027 POLY 8 4 3 U5 74HC4053 D5 -12V 75 1 2 3 4 5 6 7 LPIN R U2 1 INPUT R C7 .01 POLY 3 2 14 13 12 11 10 9 8 R19 3.65K 1% R2 330 R39 1M 5 C10 1030PF R22 2.49K 1% R20 4.99K 1% 7 C23 1.0 D1 1N5818 3 D2 1N5818 +5.00V U4B TL072 JP4 14 R28 243K 1% 1 +6V 2 3 U10A R204 1K R33 10.0K 1% 1.52 MHz R27 100 C29 1.0 5 R23 24.9K R37 1K R29 100K 1% R25 1M 3.8 MHz Y1 7.6MHZ 2 1 C13 56PF NPO C12 5.5—18PF C14 33PF NPO R34 49.9K 1% 13 U7F 14 7 U7A 74HC04 U8A 74HC390 12 1 4 2 CK CK CLR 1 0 16 Q Q QC QD 15 12 3 5 6 7 14 13 11 10 9 QA QB QC QD CK CK CLR U9B 74HC393 13 8 U8B 74HC390 12 304 Khz C L K A 14 A 11 10 9 8 Q Q QC QD CLR 7.6 MHz CLK QA QA QB QC QD 5 0 / A 1 V V G 0 D A N 0 - - D 1 1 1.9MHz U9A 74HC393 3 4 5 6 L V V S S D A A H + + / B C L K B 7 9 8 7 6 1 1 1 1 2 3 4 5 5 4 3 2 S 1 A I N V A H P A B P A L P A S 1 B I N V B H P B B P B L P B C18 .0027 POLY 1 7 1 8 1 9 R48 4.3K J1 10 11 -12V R32 10K R47 20K CLR 9 2 8 U10C R36 49.9K 1% 13 QC 11 U10D R35 10.0K 1% C16 0.1 U7B 74HC04 +12V U7C 74HC04 QD 9 VR1 LM317 1 +12V OUT IN +6V 3 C C33 1.0UF 6 R49 240 2 R244 10K U7D 74HC04 1 C35 1.0 IN OUT C X DRAWN ELKHART, IN. 46517 Z1 U5X C36 47UF MONO JFL 7-28-97 JB 1 ME SUPERSEDES SCALE NONE EE E.C. PROJ # MLOWCM0 PE CHECKED B -6V 3 R51 240 2 +5.00V PHONE (219) 294-8000 X1 X0 VR2 LM337 -12V LPIN L LPOUT L LPIN R LPOUT R +5.00V SYNC OUT SCM, FM STEREO GENERATOR STEREO -12V Current at U211 pin 17. 1718 WEST MISHAWAKA ROAD U5Y 10 GND RECEPT 12X1 CROWN INTERNATIONAL, INC. U205 Connections U7E 74HC04 11 NOTES : _______ _______ MON L MON R -6V C34 1.0UF R50 910 8 19 KHz 3.3VP-P 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% UNLESS OTHERWISE SPECIFIED. 2. ALL CAPACITORS ARE IN MICROFARADS UNLESSOTHERWISE SPECIFIED. 3. ALL DIODES ARE 1N4148 UNLESS OTHERWISE SPECIFIED. EXTERNAL COMPOSITE QB XOR QD QC XOR QD C20 .0027 POLY C32 1.0 4 1 2 3 4 5 6 7 8 9 10 11 12 R43 33K R41 510 C19 0.1 R31 100K 1% 7 5 EXT IN EXT RTN SCA IN COMP OUT COMP METER MONO/STEREO /EXT ENABLE GND INPUT L INPUT R J2 19 KHZ LEVEL 19 KHZ PHASE R242 1K Current at U211 pin 4. SEPARATION 2 0 R30 243K 1% 74HC86 12 3 1 2 3 4 5 6 7 8 9 10 11 12 3 R46 10K C21 0.1 9 7 5 3 1 RECEPT 12X1 A QB QB XOR QC -12V +12V 1 10 QA XOR QC J3 10 8 6 4 2 RECEPT 5X2 1 13 12 R40 10K U11 LMF100 1 6 7 9 2 1 1% U12 B-B 4214 14 38 KHz 3.0VP-P COMP METER C37 OPEN +12V 6 U10B R17 100 -6V R13 24.9K 1% 4 R26 1K 7 8 SYNC OUT C17 0.1 COMP OUT (•3.85V P-P) U6B TL072 R21 10K C31 1.0 C15 0.1 7 INH A B C /EXT ENABLE +6V R16 100 6 4 5 R53 10K C11 .01 POLY C30 1.0 74HC86 +6V 15 Z Z0 Z1 9 75 14 Y 6 11 10 MONO/STEREO MON R 5 2 50 R24 100 6 X Y0 Y1 5 3 1 C24 1.0 X0 X1 2 1 D6 7 U3B TL072 R18 499 1% LPOUT R C2 .0027 POLY 6 R15 (SELECTABLE BY TEST, USE 4.12K OR 4.15K IF NEEDED) 4.02K 1% R14 1K 16 12 13 JP2 LTC1064-1 OUTPUT C28 1.0 MON L U4A TL072 JP3 2 50 +6V R11 100 1 3 U206, pin6 Z0 Y Y0 C /EXT EN FILENAME: STEREO/MONO A DO NOT SCALE PRINT U5Z Z Y1 APPROVED BY : 103203A.SCM NEXT ASM: REV DWG. NO. 103203 A R52 910 STEREO GENERATOR Reference Drawings 6–7 SEE NOTE 10 TOP SIDE COMPONENT MAP, FM-VFM EXCITER UNCONTROLLED UNLESS OTHERWISE MARKED IN RED BY CM AS A CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND ASSOCIATED ELECTRONIC FILES ARE UNCONTROLLED AND ARE FOR REFERENCE ONLY. THESE DRAWINGS, SPECIFICATIONS AND ASSOCIATED ELECTRONIC FILES ARE THE PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP., AND SHALL NOT BE REPRODUCED, COPIED, OR USED AS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSION. M200440PT-A.DOC PWB: 200440-PWB-A.PCB SIZE DWG. NO. B SCALE: N/A REV 200440-PWA PROJECT #: 509 A SHEET: 1 OF 1 1 2 3 4 5 DWG. NO. 6 REV. 200440-SCH A 8 9 E . C . N. 10 11 REVISION HISTORY DESCRIPTION REV 12 DATE DWN 1 FOR PROTOTYPE 01-04-02 DW 2 MODIFIED PER MIKE SENEKI 02-06-02 DW 3 CHG'D R18 PER EAD MRH01. R18 WAS 91K OHM. U5 WAS C 6900-5 06-24-02 DW 246 A-G 4 R8 WAS 1.0K OHM. 05-23-03 DW 277 A PRODUCTION RELEASE 01-29-04 DW H APPROVALS CHK CM PE H DW DP 88-108 MHZ +8V +12V R24 150 +12V 2 MAR-6 C7 .001 R30 10 1 VU5 3 /LOCK DL1 GREEN R25 680 +5V 5 37 R33 100 1% 13 12 FSK-R C1 33PF NPO C11 C4 1 .001 C13 3900PF R11 100K 1% 8 U5C 10 R10 100K 1% MC33284P 13 12 7 9 TP RA2 RA3 RTC CLR VSS RB0 RB1 RB2 RB3 R1 10.0K 1% 10 9 8 7 6 5 4 3 2 1 D D2 1N4148 LOAD DATA CLK RP1 100K RPACK 1 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 1 R3 150K 18 17 16 15 14 13 12 11 10 RA1 RA0 OSC1 OSC2 VDD RB7 RB6 RB5 RB4 R13 100K 1% 5 D7 1N4148 + C27 10/35V D8 1N4148 C28 R63 39 +8V R81 10.0K 1% 3 C76 0.1 JP1 JUMPER C81 1000pF 1 U8A TL072 2 R83 5.11K 1% 6 5 C78 0.1 E R84 5.11K 1% -12V D5 1N4148 U8B TL072 7 S G Q72 IRFD9120 D D13 3.9V +12V 1 PB1 RESET 47/20V C77 0.1 R80 24.3K 1% F TANT. R14 100K 1% C5 .001 POLY R21 100K 1% C26 .001 + C61 R65 100K 1% TANT. U3 PIC16C61 8 U5B MC33284P POLY 9 R20 R18 68K VU5 U5A 3 1 R82 24.3K 1% C80 0.1 TP2 -12V 4.5 - 8.0V 680.0 11 MC33284P D R87 10K PWR. CNTRL TILT R86 C43 1 2 D4 1N4148 RP2 100K RPACK R89 26.7K 1% 1M 4 QH CLK QH INH SH/LD 2 15 1 7 CLK QH INH SH/LD SER A B C D E F G H 10 11 12 13 14 3 4 5 6 10 11 12 13 14 3 4 5 6 D1 1N4148 6 7 RF OUT 2 R67 15 1% R15 100K 1% A1 C24 33pF NPO R62 100 1% C62 220pF MAR-6 1 R66 150 R64 4.99K VDD R2 10.0K 1% R39 100 1% C23 .001 VCO61 POS-150 R61 10.0K 1% C15 0.01 +5V +5V U2 74HC165 2 15 1 QH SER A B C D E F G H 9 7 5 3 1 10 8 6 4 2 HEADER 5X2 E 9 U1 74HC165 U5D R16 100K 1% D12 1N4148 DATA HD1 14 C14 .001 POLY /ENABLE +5V R12 1.0K 1% MC33284P R8 100 1% CLOCK C82 .01 POLY 9 R6 100K 1% U4E 74HC14 7 5 3 1 R7 10 MC145170 C3 1-10PF C2 39PF NPO VDD C10 .001 C19 .001 1 10.24MHZ Y1 16 15 14 13 12 11 10 9 16 15 14 13 12 11 10 9 R26 680 3 R4 100K 1% F 1 2 3 4 5 6 7 8 U4F 74HC14 DL2 RED LOCK 10 4 1 2 3 Fin 4 5 6 7 8 R38 15 TANT. 8 6 4 2 U6 OSC in OSC out 11 8 R5 1.0K 1% C12 1 G C22 .001 D11 1N4148 + C21 R88 30.1K 1% REMOTE FREQUENCY CONTROL R9 100K 1% R35 499K 1% 10/35V C8 1 D6 1N4148 +8V 6 NE5532 VVCO 9 7 5 3 1 LOCK DET. 10 8 6 4 2 PL1 HEADER 5X2 U7B NE5532 C9 .001 R23 1M R22 200K R68 499K 1% 2 U7A 4 G +5V 2 GND DATA CLOCK LOAD +5V 1 A2 C44 1 8 C6 100PF 5 4 3 2 1 5 4 3 2 1 SW3 SW4 SW5 C29 1 R90 5 4 3 2 1 SW2 SW1 R19 25K LF SEP. + C30 R17 1K BECKMAN TP1 10/35V 499 1% 5 4 3 2 1 5 4 3 2 1 C79 0.1 R85 2K PWR. CNTRL. OFFSET D14 6.2V 1N753A TANT. VR3 LM317 COMPOSITE IN C41 100PF +12V 3 R27 10.0K 1% U4B 74HC14 4 U4A 74HC14 3 2 10/35V 1 R43 1.0K 1% 9 8 5 6 U4D 74HC14 U4C 74HC14 -12V +12V Local/Remote /LOCK LOCK FSK-ID-CHAN C31 .001 C33 33pF VR2 LM78L05 FSK-R 3 -12V R45 10K FSK +12V C35 .001 D10 1N4148 UNCONTROLLED THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF INTERNATIONAL RADIO CORP. AND SHALL NOT BE REPRODUCED, COPIED OR USED AS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSION. UNLESS OTHERWISE MARKED IN RED INK BY CM AS A CONTROLLED COPY, COPIES OF THESE DOCUMENTS INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS ARE FOR REFERENCE ONLY. C_L_SHT1_A.DOT REV. A 5 6 7 8 DWN CHK CM PE DW 01-04-02 DJ 01-05-02 DW 01-05-02 DP 01-05-02 INTERNATIONAL RADIO AND ELECTRONICS CORP. 25166 LEER DRIVE ELKHART, IN. 46514 574-262-8900 WWW.IREC1.COM TITLE: SIZE DISTRIBUTION 9 B IREC SCH, FM-VFM RF EXCITER DWG . NO . C K FILENAME: C16, C17, C18, C20, C25, C34, C45-60, C63-75, Q1-71, R29, R31, R32, R34, R36, R37, R49, R50, R53-60, R69-79, VCO1-VCO60. C40 1 TANT. APPROVALS BAND LIMIT A 4 + C39 FSK BAL. ID 3 +5V 10/35V AUTO ID 2 REFERENCE DESIGNATORS NOT USED: 1 R46 39K CH. SEL. DIRECT FSK 1 OUT D3 1N4148 GND GND RECEPT 13X2 IN C C42 .001 R48 1.0K 1% NOTES : 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL. 2. ALL CAPACITORS ARE IN MICROFARADS. 2 2 4 6 8 10 R44 10.0K 1% HD2 HEADER 5X2 1 3 5 7 9 COMPOSITE IN Frequency Select TANT. UNLESS OTHERWISE SPECIFIED: J1 RF OUT + C38 D9 1N4148 C32 .001 Local/Remote C 10/35V TANT. R47 1.0K 1% +8V R52 1.27K 1% 10/35V R40 10.0K 1% 25 23 21 19 17 15 13 11 9 7 5 3 1 R51 237 1% TANT. R41 10.0K 1% +5V 8.26V 1 + C37 FSK 26 24 22 20 18 16 14 12 10 8 6 4 2 OUT + C36 DL3 AMBER R28 10.0K 1% R42 10.0K 1% B IN C +5V 2 C SCALE : 10 NONE A REV A 200440-SCH PROJ NO. 11 509 SHEET 1 12 OF 1 D 8169-1 Illustration 6–8 RF Metering Board (Add 400 to component designators for schematic reference) 6–10 FM500 User's Manual +12V PAV J2-4 C401 .01 R406 100K 1 Parts not loaded: 8 2 +5.00V U2 1 J4-3 REM PADCV 1.00V = 10VDC 3 C403, 404 DZ401 R402, 403, 404 Q401, 402 U401 LB401 R401 1N4148 D406 R409 100 4 -12V R410 100 5 (Jumper under board) C406 .01 R405 2.49K 1 J402 12 13 R416 100K R425 1M U405F 74HC14 U3 3 50mv per degree C. R422 75k R420 100K 1 C407 .001 R424 100k 8 J4-6 REM PATEMP 2 14 R437 1M +12V /LOCK J4-1 D403 R435 100K D411 /+28V INH D410 J2-1 INPUT LAMP J3-16 6 U405C 74HC14 R439 100K U404A TL074 11 5 INPUT J2-12 1 3 R436 24.9K SEL A SEL B SEL C RF LEVEL +5.00V PATEMP LAMP PADC LAMP INPUT LAMP LOCK LAMP SWR LAMP LOCK LAMP J3-18 4 3 C409 .001 U4 4 2 10mV/Deg. C R419 24.9K RECEPT 12X1 U405B 74HC14 R428 10K -12V 2 4 6 8 10 12 14 16 18 20 1 3 5 7 9 11 13 15 17 19 (R435+R436)+R436 ---------------- = ---(R435+R436)-R436 SWR LIMIT= 150K R440 33K R434 10K POT H = 1.5:1 100K POWER SET 9 D405 R441 1M U4 R442 51K D404 8 DC SUPPLY J2-2 R445 R443 51K C410 0.1 R451 100K 1 U4 6 U3 6 7 R444 200K U403B TL074 R452 10K 1 ALC J4-2 5 U404B TL074 J4 RECEPT 12X1 R448 100K 1 REM BATT J4-7 5 C412 0.1 R447 1K 7 U404C TL074 R454 100 FAULT SUM REM BATT REM PATEMP REM RFWATTS REM PADCA REM PADCV ALC /LOCK 100K 10 12 11 10 9 8 7 6 5 4 3 2 1 GND R446 10K C411 0.1 J3 DPM REF DPM IN J404 +5.00V -12V +5.00V HEADER 10X2 D412 R438 120K RF LEVEL J3-8 J2 HD403 D409 R492 10K FAN J2-7 U403D TL074 PAV PAI DC SUPPLY /+28V INH PATEMP LAMP J3-12 R431 120K R430 100K FAULT SUM J4-8 12 11 10 9 8 7 6 5 4 3 2 1 +5V R432 100K C408 1.0UF 12 R427 240K 5.00V = 100 deg. C C431 0.1 U3 13 R426 30.1K 1 10 U403C TL074 10 U405A 74HC14 R429 220K -12V R423 240K R421 100 11 U405E 74HC14 D402 U403A TL074 11 -12V U3 9 D408 R415 120K 1 INPUT RF REV RF FWD RFV VOLTMETER FAN TEMP OUT PADC LAMP J3-14 +12V 4 -12V +12V RECEPT 5X2 D401 1 C421 .001 TEMP OUT J2-6 13 9 7 5 3 1 +5V C405 .001 U4 U404D TL074 2 -12V +12V SWR LAMP J3-20 D407 R413 33K 12 R407 10.0K 1 10 8 6 4 2 U405D 74HC14 14 R408 1.1K 1 R418 1K R414 2.2M J4-4 REM PADCA 1.00V = 10.0A U402B TL072 J401 +5V 8 9 R412 10K POT H 7 PAI J2-3 PAI LIMIT U402A TL072 6 R450 10K U5 R411 15K -12V R449 11K 1 +5V (1.999V reads "1999") FULL SCALE 16 RF POWER (RFV SQUARED) .001V per Watt R453 RF POWER SWR ALC PA DCV PA DCI PA TEMPERATURE SUPPLY DC VOLTS VOLTMETER 1.1K 1 10mV/Volt 100mV/Amp 1mV/Degree C 10mV/Volt 10mV/Volt R455 100K 1 VOLTMETER J2-8 C413 0.1 R456 1K 1 U406A TL074 U6 1 3 D413 1N6263 (VFWD+VREFL)/40 R486 100K 13 100K R487 R458 22K R484 10K D418 U406B TL074 7 5 RF FWD J2-10 Q403 2N5210 +5V 16 U6 13 14 15 12 1 5 2 4 (VFWD-VREFL)/4 U406D TL074 1.00V R491 2.49K 1 +5.00V J3-9,10 J4-12 R464 1K R463 100K NUMBERS USED: R1-91 (C2) C1-29 R489 24.9K D414 1N6263 C417 .001 C416 .01 U8 U408 74HC4051 INH A B C R490 10.0K 1 1K R459 100K 14 U6 C422 0.1 R488 24.9K 12 6 DPM IN J3-19 3 +5.00V SWR CAL R468 1K -12V R461 10K X X0 X1 X2 X3 X4 X5 X6 X7 8 R466 56K R465 56K R460 11 C415 .001 C414 .01 6 11 10 9 1K POTH 2 RF REV J2-11 R467 +12V 4 R457 10K 13 14 15 12 1 5 2 4 1999 WATTS 19.99 19.99V 199.9V 19.99A 199.9 Deg. C 199.9V 199.9V J3-2 J3-4 J3-6 +5.00V 6 11 10 9 SEL A SEL B SEL C X0 X1 X2 X3 X4 X5 X6 X7 X 3 C423 0.1 DPM REF J3-17 U9 U409 74HC4051 INH A B C 8 D417 +5V R462 22K 1 C1 8C 2 B2 7B 3 6E E3 4 5 4 Q405 C420 .01 U407A TL074 RFV J2-9 R469 10K +12V 4 2 1 3 11 C418 .01 D415 1N6263 LM394 1 8C 2 C1 7B B 3 2 6E E3 4 4 5 Q406 R472 10K POT H R471 100K C419 .001 R473 10K 6 5 -12V U7 R481 39K R483 1M R476 49.9K 9 8 7 6 5 10 VDD +12V -12V 8 9 (2.5VDC at 100W) (.135V) R479 1.1K 1 R482 1K R477 7.5K R474 3.3K R475 49.9K R478 10.0K 1 13 12 -6.9V C424 1.0UF U7 14 R480 100 10 VR401 78L05 +12V 1 C425 1.0UF U7 U407C TL074 7 U407B TL074 R470 22K 8 7 6 5 D416 POWER CAL U7 R485 100K LM394 IN OUT C 2 U6 (Clamp SWR reading below 5W.) DZ402 LM329DZ +5V U8,9 pin 7 C426 1.0UF C429 1.0UF R417 3.3K VSS 8 U406C TL074 VCC 3 -12V C427 1.0UF C428 1.0UF VEE -12V -6.9V FM500 METERING 103204A J4-5 REM RFWATTS (1.00V at 100W) U407D TL074 METERING Reference Drawings 6–11 6 - 12 FM30/FM100/FM250 User's Manual DWG. NO. 1 2 3 4 REV. 1 201207-SCH 5 6 7 8 9 5 E . C . N. HD7 FAN FAN+12V ALC / METERING HEADER 2 .156 H RF EXCITER U2 2 3 J2 J1 HD42 1 2 3 4 5 6 7 8 9 10 11 12 HEADER 12 +5.00V 1K HD31 HEADER 5 x 2 +12V DATE DWN 02-05-05 DW PE DW Vin NC GND 7 2 6 3 TRM TL072 1 U3A -12V +5.00V Z9 R43 OPEN 100 C51 5 H C52 .01 C50 1.0 +12V 8 C54 1.0 1.0 26 HEADER J5 MCX J6 MCX TL072 7 U3B 6 NC ALC -12V R29 1K /LOCK FSK IN NC +12V TEMP FAN V-METER RFV RF FWD RF REV INPUT /LOCK FAULT DC SUPPLY PAI PAV /LOCK ALC METER PAV METER PAI METER RFW METER PATEMP METER BATT FAULT SUM .01 1 2 3 4 5 6 7 8 9 10 NC 5 C10 HD4 HD41 HEADER 12 FOR PROTOTYPE REF02 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 HD44 R26 J1 NC TEMP Vout 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 J4 1 2 3 4 5 6 7 8 9 10 R25 Q1 OPEN IRF541 1 2 3 4 5 6 7 8 9 10 .01 1 2 3 4 5 6 7 8 9 10 11 12 C27 .01 1 2 3 4 5 6 7 8 9 10 11 12 C26 1 2 3 4 5 6 7 8 9 10 11 12 1.0 TP1 VOLTMETER G 1 C54 .01 REV APPROVALS CHK CM +12V 1 2 3 4 5 6 C25 REVISION HISTORY DESCRIPTION R42 4.7K HD2 HEADER 6X1 .156 12 11 6 1 AUDIO PROCESSOR SHUNT +12V 1 2 10 Z31 OPEN R28 1K G -12V ADD FOR M2HD-S MOTHERBOARD ONLY R27 1K AUDIO PROCESSOR RFX OUT /LOCK ALC HEADER 5 x 2 HD12 COMP OUT +12V NC HD5 C41 .001 1 2 3 FSK IN NC RIGHT C42 .001 HEADER 3X1 NC F FAULT SUM METER BATT METER PATEMP METER RFW METER PAI ALC METER PAV INPUT R IN1 TEMP R IN2 HD3 LPIN L NC NC LPOUT L LPIN R LPOUT R NC Z30 JUMPER NC NC C17 .01 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 NC +12V HD61 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 J3 J1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 +12V -12V /+6DB /+12DB L VU R VU +5.00V PROC A PROC B PROC C BR GR HEADER 10 x 2 HI GR NC Z32 Z33 OPEN OPEN HEADER 13 x 2 HEADER 10 x 2 E -12V INSTALLED WHEN USING AUDIO PROC. SHUNT CKT. C18 JUMPER .01 COMP METER COMP METER Z28 NC ALC JUMPER C19 .01 STEREO/MON +12V Z27 C40 OPEN C39 OPEN C38 OPEN C36 .01 C35 .01 C34 .01 C33 .01 C32 .01 C30 .01 C31 .01 C29 .001 C28 .001 JUMPER C20 .01 TP2 +12V Z26 JUMPER C21 .01 STEREO GENERATOR Z25 Z24 JUMPER C23 .01 Z23 JUMPER +5.00V HD22 MON L MON R C24 .01 NC LPIN L LPOUT L LPIN R LPOUT R 38KHZ 38KHZ COMP METER COMP METER /EXT ENABLE /EXT ENABLE 1 2 3 4 5 6 7 8 9 10 11 12 +12V 1 2 3 4 5 6 7 8 9 10 11 12 +12V HD23 STEREO/MON RIGHT LEFT Z22 OPEN J3 1 2 3 4 5 6 7 8 9 10 11 12 _/CARRIER OFF 4 _FSK IN R16 220 11 _ALC R15 100 3 _COMPOSITE OUT R14 390 10 _38 KHZ OUT R13 390 _/EXT ENABLE R12 1K R IN2 1K L IN2 1K C5 220pF C4 220pF C6 220pF FSK IN C2 220pF Z5 JMP2 OPEN R11 220 /EXT ENABLE C11 .01 C12 OPEN C13 .001 C14 .001 C15 C16 .01 .01 OPEN Z3 C3 220pF Z2 JUMPER Z1 JUMPER JMP1 OPEN DB15 R4 1K COMP METER C7 220pF R1A R3A 300 300 R4A 300 300 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL. 2. ALL CAPACITORS ARE IN MICROFARADS. Z13 R9 1K Z7 R8 1K R5 1K R6 1K 1 Reference Drawings 2 3 50 KOHM 600 OHM Z1, Z2 ON Z3, Z5, Z7, Z8 OFF Z4, Z6 OFF Z1, Z2 ON Z3, Z5, Z7, Z8 ON Z4, Z6 OFF 4 OMNIA BOARD AES/EBU INPUT 3 1 Z1, Z2 OFF Z3, Z5, Z7, Z8 OFF Z4, Z6 ON OPEN Z11 EXT RTN 240 OPEN EXT IN 1 2 3 4 5 HD6 OPEN OPEN R33 R34 24.9K 1% 24.9K 1% 2 R35 C48 1.0 TL072 1 U1A HI LO GND REF. FOR XLR CON. 3 24.9K 1% -12V UNCONTROLLED UNLESS OTHERWISE MARKED IN RED INK BY CM AS A CONTROLLED COPY, COPIES OF THESE DOCUMENTS INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS ARE FOR REFERENCE ONLY. 6 7 8 D3 R32 1K C49 1.0 R38 4.02K 1% +12V R36 24.9K 1% ANALOG LEFT/RIGHT LEFT IN 1 LEFT IN 2 5 R41 1K SCA IN R10 B 100 OPEN Z8 1 2 3 3 2 1 2 NON-OMNIA BOARD INPUT IMPEDENCE A R39 Z14 OPEN J2 OPEN INPUT CONFIGURATION CHART R40 100 OPEN R7 1K Z10 J1 XLR STEREO GENERATOR SHUNT OPEN Z12 C1 220pF R2A OPEN UNLESS OTHERWISE SPECIFIED: C8 220pF OPEN R2 2 1 L IN2 1K Z4 NOTES: HEADER 12 C9 220pF R3 R IN1 C J1 1N4148 12 TP5 GND -12V 1 2 3 4 5 6 7 8 9 10 11 12 D2 _/AUTO CAR. OFF 1 2 3 4 5 6 7 8 9 10 COMP METER 5 OPEN R1 COMP OUT _FAULT SUM SCA IN 13 Z6 EXT RTN _METER BATT EXT IN _METER PA TEMP 6 MON_R MON_L EXT_IN EXT_RTN SCA _METER RFW 14 R IN1 L IN1 _METER PAI 7 1 2 3 4 5 6 7 8 9 10 HEADER 5 x 2 R17 220 OPEN Z21 R19 220 R18 220 OPEN Z20 R20 220 OPEN OPEN OPEN Z19 R21 220 Z18 Z17 R23 220 R22 220 OPEN OPEN Z16 Z15 R24 220 ALC _METER PAV 15 TP4 +12V J2 HD21 J4 8 D +5.00V HEADER 12 C 9 TP3 -12V C22 .01 COMP OUT JUMPER D1 1N4148 B +5.00V HD13 Z29 HEADER 10 x 2 D J2 HD11 L IN1 L IN2 E 1 2 3 4 5 6 7 8 9 10 HEADER 5 x 2 C43 .001 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 1N4148 V+ TEMP GND LEFT R37 6 3.9K 5 IREC TL072 7 U1B APPROVALS THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP. AND SHALL NOT BE REPRODUCED, COPIED OR USED AS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSION. 9 10 DWN CHK DW 11-23-04 CM DW 11-23-04 INTERNATIONAL RADIO AND ELECTRONICS CORP. 25166 LEER DRIVE ELKHART, IN. 46514 WWW.IREC1.COM Error : logo3A.jpg file not found. 574-262-8900 DISTRIBUTION K FILENAME: A TITLE: PE SIZE SCH, FM/IBOC MOTHER BOARD REV DWG . NO . 201207-SCH D SCALE : NONE 11 1 PROJ NO. SHEET 1 OF 1 12 6 - 13 Jumper FMA "E" Z1 Z2 Z3 Z4 Z5 Z6 Z7 Z8 Z9 Z10 Z11 Z12 Z13 Z14 Z15 Z16 Z17 Z18 Z19 Z20 Z21 Z22 Z23 Z24 Z25 Z26 Z27 Z28 Z29 Z30 Z31 Z32 Z33 JMP1 JMP2 Short Short Open Open Open Open Open Open Short Short Short Short Short Short Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Open Short Short Open Open FMA "T" 50K input Short Short Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Open Open Open Open Open FMA"T" 600 input Short Short Short Open Short Open Short Short Open Open Open Open Open Open Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Open Open Open Open Open FMA "R" Short Short Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Open Open Open Open Open FMA "Omnia" Analog input Short Short Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Open Open Open Open Open FMA "Omnia" AES input Open Open Open Short Open Short Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Open Open Open Open Open FMX "E" FMX "T" 50K input Short Short Short Short Open Open Open Open Open Open Open Open Open Open Open Open Short Open Short Open Short Open Short Open Short Open Short Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Short Short Short Short Short Short Short Short Open Open Short Open Short Open Open Open Open Open FMX "T" 600 input Short Short Short Open Short Open Short Short Open Open Open Open Open Open Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Open Open Open Open Open FMX "R" FMX "Omnia" Analog input Short Short Short Short Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Short Short Short Short Short Short Short Short Open Open Open Open Open Open Open Open Open Open FMX "Omnia" AES input Open Open Open Short Open Short Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Short Short Short Short Short Short Short Short Open Open Open Open Open FMX RMS Short Short Short Short Short Open Open Open Open Open Open Open Open Short Short Short Open Open Motherboard Configuration Chart 6-14 FM30/FM100/FM250 User's Manual R27 D 8167-5 Illustration 6–10 Display Board (Add 600 to component designators for schematic reference) 6–14 FM500 User's Manual U602 LM3915 JP601 +12V +12V R601 68K L VU R602 100K 8 R604 1.2K D601 1N4148 8 2 3 4 U601A TL072 7 6 5.00V R603 1K 1 C601 1.0UF 9 5 C602 1.0UF D602 1N4148 4 3 +12V 2 -12V 1 MODE DL601-610 +5V RADJ L9 ROUT L8 DHI L7 IN L6 DLO L5 V+ L4 V- L3 L1 10 L10 11 YEL 12 G G DL621-625 16 1 8 GRN 18 L 1 C603 1.0UF R VU R607 68K D603 1N4148 6 7 7 6 5.00V R609 1K 5 U601B TL072 9 8 R610 1.2K 5 C604 1.0UF D604 1N4148 4 3 +12V 2 1 MODE L 6 1 3 1 2 1 1 D L O 2 3 I N 4 L 9 L 1 0 D H I R O U T R A D J M O D E COMPOSITE HI GR +12V +12V ROUT L8 DHI L7 IN L6 V- L3 L1 L2 Y Y G G G G Y 1 8 R615 33K 50mA L 2 GRN 15 L 3 GRN 18 1 5 L 4 L 5 U605 GRN 17 1 6 1 4 L 6 1 3 1 2 R624 1M L 7 L 8 L 9 L 1 R616 33K +5V V 1 D L O V + 2 3 D H I I N 4 7 6 5 R612 M O D E C608 .001 8 L4 V- L3 L1 L2 C634 1.0UF R633 33K ST/MON R657 1K BECKMAN RF LEVEL INPUT 6 SW602 DITHER 10V P-P DITHER 12 PA TEMP DECIMAL POINT 13 R619 510 R620 220K PATEMP LAMP U606B TL072 R632 620 C609 1.0UF DL659 RED +5V DP100 R656 220 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 DL636-643 Pin 1, upper left from front of unit. F.S. RF POWER +12V C631 1.0UF OUT C 2 SWR 19.99 ALC 19.99 PA DC VOLTS 199.9 VDD VCC +5V 3 C624 1.0UF C629 1.0UF GRN GRN 16 14 U10 U11 U9 GRN 7 PA DC AMPS -12V 2 1 1 1 1 1 1 1 1 1 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 U612 C622 1.0UF C630 1.0UF R638 100K C618 0.1 DPM REF SUPPLY DC VOLTS 199.9 VOLTMETER 199.9 GRN UP SW605 R651 2.2K R628 1K 1 C617 0.1 R637 470K U609C 74HC14 5 C619 100PF U609D 74HC14 9 11 Reference Drawings 8 DOWN SW606 R654 1K R640 100K 2 X R641 10K 15 1 10 9 C621 .01 3 4 5 4 11 14 R642 10K A B C D QA QB QC QD UP DN LOAD CLR CO BO U609E 74HC14 10 1 3 5 7 9 11 13 15 17 19 +12V -12V /+12DB /+6DB 5.00V +12V -12V COMPOSITE MON/ST HEADER 10X2 3 R630 150 INH A B C J602 SEL A SEL B SEL C RF LEVEL 5.00V PATEMP LAMP PADC LAMP INPUT LOCK LAMP SWR LAMP U610 74HC193 U609B 74HC14 C633 .001 X0 X1 X2 X3 X4 X5 X6 X7 2 4 6 8 10 12 14 16 18 20 1 3 5 7 9 11 13 15 17 19 5.00V DPM REF DPM IN HEADER 10X2 SEL A SEL B SEL C 3 2 6 7 12 13 SCM, FM DISPLAY +5V NOTES : C614 0.1 C615 0.1 6 C632 .001 R639 100K +5V DZ601 6.2V 13 14 15 12 1 5 2 4 6 11 10 9 U609A 74HC14 C620 .01 -12V R636 100K 199.9 GRN C627 1.0UF R635 100K PA TEMPERATURE ICL7107 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 C616 0.1 POLY GRN VEE VSS 2 4 6 8 10 12 14 16 18 20 GND U611 74HC4051 19.99 8 -12V +5V +12V -12V L VU R VU 5.00V PROC A PROC B PROC C BR GR HI GR 1999 GRN VR601 7805 DPM IN J601 GRN +12V /+12DB U609F 74HC14 DL647 RED D617 D616 /+6DB INPUT DP10 C623 1.0UF STEREO +5V PA DC 5 U606A TL072 IN GRN SW601 DL646 RED 7 1 GRN 18 GRN DL645 RED R650 100K BECKMAN PROC B R634 5.1K DP10 DP100 GRN 17 LOCK UNITS +5V GRN 16 MONO SWR LAMP 5.00V R631 5.6K -12V TENS V+ GRN 15 SWR 9 3 100's L5 R629 680 5.00V PADC LAMP 1000 DLO GRN 14 C625 0.1 DL644-647, 659 C613 .01 1 DL101 DISPLAY L6 LOCK LAMP +12V 4 IN GRN 13 SW603 PROC C 2 1 1 1 1 1 1 1 1 1 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 L7 DITHER R655 4.7K +5V 2 DHI YEL 12 PROC A R617 1K Q602 MPS-A56 L8 "PILOT" R649 10K POT H MOD. CAL. BR GR 330 R611 1K ROUT RED 11 R625 10K R618 1.2K +12V L9 "110" GRN DL644 RED C607 0.1 1 RADJ R652 5.6K 10 L10 R626 33K 1 0 8 2 MODE C628 1.0UF -12V GRN RED R647 1K L 1 0 R A D J 3 +12V 4 D607 LM3914 R O U T 1 C610 0.1 C612 .001 4 1K 8 RED 1 1 DITHER GRN 16 1 7 2 3 DL626-635 GRN 14 Q603 2N5210 5 GRN 13 R648 D618 4 G G 6 5 +12V U607B TL072 7 3 +5V YEL 12 L4 C606 0.1 RED R653 1K 1 -12V 11 L5 8 2 U607A TL072 D606 1N6263 6 5.00V U613A TL072 8 7 R643 3.3M R623 10.0K 5.00V C605 .001 2.7K 1N6263 R622 10.0K 1.2K R627 -12V R614 R613 1K U608 LM3914 9 9 8 7 6 5 JP603 JUMPER FOR BAR R646 10M D605 L 8 LM3914 V + 5 1 0 L 7 330 10 L10 L9 V+ 1 4 L 5 DL11-20 RADJ DLO V 1 1 5 L 4 U604 Q601 MPS-A56 +12V 1 6 L 3 +5V GRN RED 1 7 L 2 +5V +12V 7 R644 33K GRN 17 C611 0.1 DL648-658 C626 1.0UF GRN R605 1K R608 100K +12V GRN 15 6 Q604 2N5087 R645 100 Y 50mA 14 U603 LM3915 G GRN R606 JP602 G GRN 13 L2 U613B TL072 RED 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% UNLESS OTHERWISE SPECIFIED. 2. ALL CAPACITORS ARE IN MICROFARADS UNLESS OTHERWISE SPECIFIED. 103206 DISPLAY 6–15 Reference Drawings 6 - 17 CARR SW R701 4.7K U703C R702 10K /CARRIER OFF 5 6 ELKHART, IN. 46517 R723 1K D701 1N4148 U703A R704 10K /AUTO CARRIER 1 3 2 +6V +12V R705 91K 4 D703 1N6263 2 1 1 1 C701 .01 11 R716 10K 7 12 5 U701B TL074 R715 2.2K R714 220 -12V R710 75K 1 13 R711 100K 14 DL701 GREEN DL702 RED C704 .001 R712 1M 7 5 4 6 14 13 15 1 2 3 Q4 Q5 Q6 RST Q7 Q8 Q9 Q10 Q12 Q13 Q14 R721 24.9K 1 VDD C705 1.0 POLY FILENAME: TIME-OUT SELECT 2 4 6 8 10 1 3 5 7 9 APPROVED BY : SUPERSEDES NONE EE E.C. MLOWCMO PE DWG. NO. 10.SCM 9 8 2. ALL CAPACITORS ARE IN MICROFARADS UNLESS OTHERWISE SPECIFIED. 74HC14 INPUT FAULT HEADER 5X2 C706 1.0 POLY Modifications for use with 12.5V RF driver. Remove: PROGRAM DETECT (C707) (R726) (R708) (R749) 9 8 10 U706 L704 R745 R744 C724 D713 R720 10K R724 100 +UNREG 1 2 3 4 C711 .01 C709 2200PF POLY R725 100K 1 2 3 4 C715 0.1 R735 51 R736 2K 11 12 U703F 74HC14 Q701 IRF540 R737 4.3K R738A 1.0 0.5W LM3578 U1 C723 330 100V U2 1 -IN V+ 2 +IN CS 7 R732 100K to 49.9K D714 1N5822 to MUR110 DZ703 1.5KE36A to ICTE-12 C721, C722 3300UF to 220UF/50V Add: 1UF/100V between L701 and L703 under board. 7912 regulator, using "L704" pads. Jumper "U706" pads 1 and 2. DZ705 8 IR2125 1 VCC VB 2 IN 8 7 OUT 3 OSC C 6 3 ERR CS 6 4 GND E 5 4 ESS VS 5 R738A 1.0 0.5W Q704 MJE15028 L701 380UH C718 220 63V D711 MUR110 10 Change: (+13.5V) R728 68K C710 56PF NPO OPEN C713 100PF 8 7 6 5 1 2 3 4 8 7 6 5 C714 0.1 R748 10K 13 C707 .001 8 7 6 5 R730 2.2K D709 VDD 1 2 3 4 U705 IR2125 8 7 6 5 DZ702 1N9661B 16V D710 1N4148 C712 1.0 U704 LM3578 P701 R734 10K Q705 MPSA06 R749 1.5K R739 510 DZ703 ICTE-12 R740 10 C719 1000 35V DRVR V+ C725 220 63V R741 1K R729 4.12K 1 U706 LM2576–ADJ Q702 MPSA06 1 2 3 4 5 -12V +12V METER UNREG R750 100 R742 1K R744 1.1K 1% R745 10K 1% +UNREG +12V L702 960UH INPUT FAULT +12V SYNC -12V DRVR V+ PAV PAI ALC HD701 /LOCK FAULT R751 JUMPER D715 1N4004 R743 220 C717 1UF R732 82.5K 1 R727 620 R726 100K 6 5 4 3 2 1 (+12.5V) Q703 MPSA56 U703E 74HC14 C708 220 Pf CARR SW DRVR V+ A THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF CROWN INTERNATIONAL, INC. AND SHALL NOT BE REPRODUCED, COPIED, OR USED AS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSION. 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% UNLESS OTHERWISE SPECIFIED. 28V ENABLE REV 103207 NEXT ASM: R719 10K U701C TL074 DO NOT SCALE PRINT ME NOTES : _______ _______ U703D D708 1N4148 JP701 MINUTES 0.5 2 4 8 9 10 PO PO R718 100K 12 U701D TL074 R722 100K PI R717 10K D704 1N6263 SCALE VSS U702 74HC4060 D706 1N4148 U701A TL074 8-25-97 JFL CHECKED PROJ # 6 R708 100K 3 C703 .001 R706 5.1K R713 100K R709 1K DRAWN VCC DZ701 1N4735 6.2V +12V D707 1N4148 R707 180K VDD 4 74HC14 Fo=5KHZ BPF; Q=3 C702 .001 FM VOLTAGE REGULATOR D702 1N4148 U703B 74HC14 VDD PHONE (219) 294-8000 74HC14 VDD R703 4.7K AUDIO or COMPOSITE COMP2 CROWN INTERNATIONAL, INC. +12V 1718 WEST MISHAWAKA ROAD R733 4.7K +12V 6 5 4 3 2 1 HD704 1 1 1 1 1 2 2 4 6 8 0 2 4 6 8 0 1 2 3 c 8667-5 COMP2 38KHZ /CARRIER OFF /AUTO CARRIER FAN A10124-22 HD703 DZ704 ICTE-12 D713 1N5822 Inductor Data HEADER 6 (TO POWER REG. BOARD) L701 L702-703 L 380uH 960uH Wire #22 #26 1 3 5 7 9 1 1 1 1 1 1 3 5 7 9 HD702 C720 220UF 50V Turns 80 Micrometals T90 core 165 C724 47 20V D714 1N5822 -12V L704 960UH -12V L703 960UH C721 3300UF 16V C722 3300UF 16V VOLTAGE REGULATOR Reference Drawings 6–17 Illustration 6–12 Power Regulator Board 6–18 FM500 User's Manual 1 2 3 4 5 6 REVISION HISTORY DESCRIPTION ON CHASSIS E . C . N. BATTERY ~ - DC INPUT + C1001 0.015F 110V ~ D804 BYV72EW-150 P802 FASTON TAB PRODUCTION RELEASE 8 DATE DWN 10-31-03 DW APPROVALS CHK CM PE DW DP 274 B CORRECTED Z3 AND Z6 UNIT STATUS FOR M2 AND FM100 01-29-04 DW DW DP 323 C SWAPPED Z1, Z2 TO MATCH PWB 08-10-04 DW DW DP 2 F REV A 3 1 P801 FASTON TAB 7 P806 FASTON TAB F P803 FASTON TAB CIRCUIT BREAKER L801 P804 + UNREG IN FASTON TAB P805 FASTON TAB P807 FASTON TAB HD1 DZ801 U801 1 2 +IN CS OSC C GND E 8 U2 7 6 1 5 2 LM3578AN R806A 330K 2 * Z7 1 2 R807 2.2K C805 100PF 4 VB IN OUT ERR CS ESS VS C809 .1 8 R809 51.0 7 R811 6 C808 5 .0027 IR2125 R810 2.0K D803 BYV72EW-150 1N966B 16V 3 * Z8 B REF DES L802 R811 R827 R828 DZ806 DZ807 R805B 200K D805 1N4148 6 - 20 1 R818B 2.0K 2W C813 .01UF R817B 1 2K 2W * Z5 TP2 R815 100.0 R816 1.0K 1% R813 1.0K UNIT CONFIGURATION FM250 FM500 EURO OPEN SHORT SHORT SHORT OPEN SHORT SHORT OPEN OPEN H43608-1 3.3K OPEN OPEN OPEN OPEN OPEN SHORT SHORT SHORT OPEN SHORT SHORT OPEN OPEN H43395-5 3.3K OPEN OPEN OPEN OPEN OPEN SHORT SHORT OPEN SHORT OPEN SHORT OPEN SHORT H43533-1 3.3K OPEN OPEN OPEN OPEN OPEN SHORT SHORT OPEN SHORT OPEN SHORT OPEN SHORT H43533-1 3.3K OPEN OPEN OPEN OPEN SHORT OPEN SHORT OPEN SHORT OPEN OPEN SHORT SHORT H43533-1 3.3K OPEN OPEN OPEN OPEN OPEN SHORT SHORT OPEN SHORT OPEN SHORT OPEN SHORT H43533-1 5.11K 1% OPEN OPEN OPEN OPEN UNCONTROLLED UNLESS OTHERWISE MARKED IN RED INK BY CM AS A CONTROLLED COPY, COPIES OF THESE DOCUMENTS INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS ARE FOR REFERENCE ONLY. 2 * Z4 2 2 P808 PA-DC OUT FASTON TAB R818A 2.0K 2W C820 0.01UF DISK TP1 C819 .01UF U803 OP-27GNB 2 3 DZ802 1N966B 16V NOTES: HARRIS M1 OPEN SHORT OPEN OPEN SHORT OPEN SHORT OPEN SHORT H43533-1 3.3K INSTALLED INSTALLED INSTALLED INSTALLED HARRIS M2 UNLESS OTHERWISE SPECIFIED: SHORT OPEN C818 .1UF R822 22.0K Q802 MPSA56 R814 22.0K 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL. OPEN SHORT OPEN OPEN SHORT SHORT H43533-1 3.3K INSTALLED INSTALLED INSTALLED INSTALLED INTERNATIONAL RADIO AND ELECTRONICS CORP. 25166 LEER DRIVE ELKHART, IN. 46514 574-262-8900 Error : logo3A.jpg file not found. WWW.IREC1.COM APPROVALS 5 DWN CHK CM PE DW 09-30-03 DW 09-30-03 DP 09-30-03 DISTRIBUTION FILENAME: TITLE: SIZE SCH, FM POWER REGULATOR REV. DWG . NO . 200915-SCH B 200915-SCH 6 B IREC 2. ALL CAPACITORS ARE IN MICROFARADS. THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP. AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSION. 4 C Q803 2N5087 6 3 FM100 C10582-2 PWB_100969-1 B_L_SHT1_A.DOT REV. A + OPEN FM30 PWB_REV.G C811 C810 330/100V + * R819 .04 OHM 15W 3% 4.7UF/63V R820 100K FM1 A DZ803 1N4735 6.2V L803 30UH 7 2 * Z1 Z2 Z3 Z8 Z7 Z6 Z4 Z5 Z9 R812B 0.1 5W C806 R804 10.0K 1% JUMPER R812A 0.1 5W L802 * DZ807 R806B R805A 330K 2 * Z9 * R817A 100 1 + 1 C Q804 MPSA06 200K * Z6 1 R821 10.0K Q801 IRF540 8 1 C814 1/50V VCC C 7527-2_6 HDR * R828 30K 4 1 56PF V+ 3 82K 2 4 3 D C804 .01 C803 R803 C801 220PF C802 2200PF POLY 1 3 -IN 1.0K D802 1N4148 C812 1/50V REV. 1.0K 330/100V *DZ806 * Z1 1 2 3 4 5 6 R808 C * R827 2 1 1 2 2 1N4735 6.2V R802 10K PA VOLTAGE SET C817 330/100V * Z3 1 1N966B 16V 24.9K + DWG. NO. 200915-SCH 1 * Z2 R801B + E R801A 27.4K 2 E 30UH C816 330/100V + C815 330/100V SCALE : NONE 7 PROJ NO. 533 A C SHEET 1 OF 1 8 FM30/FM100/FM250 User's Manual R19 R20 Illustration 6–13 Power Amplifier (Add 1100 to component designators for schematic reference) 6–20 FM500 User's Manual C909 L904 L903 23.2uH U900 10.4uH R900 MRF 137 680PF C908 27PF C907 5PF C910 36PF THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF CROWN INTERNATIONAL, INC. AND SHALL NOT BE REPRODUCED, COPIED, OR USED AS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSION. C906 36PF C905 10PF 9 C903 0.01 8 CA2832 7 5 3 2 CROWN INTERNATIONAL, INC. 1718 WEST MISHAWAKA ROAD J2 R900 51 DRAWN JFL C900 RF DRIVER BD SCALE R901 51 0.01 SUPERSEDES NONE EE E.C. R103 PE FILENAME: 1001771A.SCM REV 100177 NEXT ASM: A R904 51 D900 1N753A 6.2V 0.01 ME DWG. NO. PROJ # L900 33uH C902 DO NOT SCALE PRINT APPROVED BY : 7-12-96 CHECKED R903 4.7K PHONE (219) 294-8000 FM500 P.A. 1 T900 L902 ELKHART, IN. 46517 R902 2.7 5W R905 10K C904 C901 NOTES : _______ _______ 0.01 0.01 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% UNLESS OTHERWISE SPECIFIED. J3 J5 2. ALL CAPACITORS ARE IN MICROFARADS UNLESS OTHERWISE SPECIFIED. C1126 0.1 J1 L1121 50NH R1101 15K DZ1110 1N4735 6.2V R1110 10K C1121 0.01 DISC C1110 R1120 2.7K 0.01 C1122 0.01 DISC TEMP SENSE LM35DZ 1 2 3 R1111 10K POT V C1132 0.1 L1122 50NH C1111 0.01 R1112 5.6 R1113 5.6 2W 2W Q1101 BLF278 C1127 0.1 R1116 10K C1112 0.01 T1111P R1119 200 3W C1134 0.1 C1133 0.1 C1135 0.1 C1136 0.1 C1138 0.068 T11S C1114 0.01 C1137 0.1 C1125 60PF R1117 24 3W C1116 27PF C1128 0.1 C1113 0.01 C1123 0.01 C1124 0.01 T1121 C1115 0.01 R1114 5.6 2W 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 R1115 5.6 2W PA INPUT BD PA OUTPUT BD L1125A L1124A C1129 L1123 L1126 0.1 L1124B L1121 50NH R1101 15K DZ1110 1N4735 R1110 10K L1125B C1121 0.01 DISC C1110 0.01 R1120 2.7K 6.2V ZENER C1122 0.01 DISC J2 R1111 10K POT V R1112 5.6 2W 5.6 2W 27PF C1138 0.068 T11S C1114 0.01 R1114 5.6 2W _ B1 _ B2 _ B3 C1125 60PF R1117 24 3W C1116 PA INPUT BD Q1101 BLF278 C1113 0.01 C1112 0.01 T1111P C1130 0.1 R1113 R1116 10K R1119 200 3W C1131 0.1 L1122 50NH C1111 0.01 C1123 0.01 C1115 0.01 C1124 0.01 + + T1121 + R1115 5.6 2W PA OUTPUT BD FM500 POWER AMPLIFIER Reference Drawings 6–21 P10421-9 Illustration 6–14 RF Output Filter (Add 1200 to component designators for schematic reference) 6–22 FM500 User's Manual (455MHz) (195MHz) (176MHz) (252MHz) C1202 1.35PF C1204 7.1PF C1206 9.3PF C1208 5.13PF C1211 47PF NP0 R1202 * 75 R1203 10 RF OUT RF IN L1202 90.5NH L1201 250NH C1201 15.4PF C1201A 10PF L1203 94.1NH C1203 40.9PF C1217 3.5PF C1205 38.9PF C1209 14.1PF C1207 37.7PF C1209A 2PF R1201 100 D1202 1N6263 C1212 47PF NP0 D1201 1N6263 Approx. 7V RMS with 200W RF in. R1209 1K R1206 1K RF MONITOR C1213 .001 INDUCTORS I.D. TURNS L1201 0.25" 0.7" #17 L1202 0.5" 3 0.6" #12 L1203 0.5" 3 0.5" #12 L1204 0.5" 3 0.7" #12 L1205 0.4375" 3 0.6" #12 14 EXACT COIL LENGTHS ARE FACTORY-SET. * IF NECESSARY, SELECT R1202 FOR SWR READING OF 1.1 OR BETTER WITH 50-OHM LOAD. R1205 = R1202 R1202,R1203,C1211,D1202,C1216 ON UNDERSIDE OF CIRCUIT BOARD. R1205 * 75 R1204 10 C1219 47PF SM HD1201 1 2 3 C1218 47PF SM L1205 77.9NH L1204 87.5NH LENGTH GUAGE C1214 .01 R1207 100K C1215 .01 R E F L C1216 .001 R1208 20K F W D R1210 10K RFV D1203 1N6263 R1211 100K C1220 .01 1 2 3 4 5 HD1202 HEADER 5 NOTES : _______ _______ 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% UNLESS OTHERWISE SPECIFIED. 2. ALL CAPACITORS ARE IN MICROFARADS UNLESS OTHERWISE SPECIFIED. 3. C1201-1209A,1217 are circuit board pads. 103209 RF OUTPUT FILTER & REFLECTOMETER Reference Drawings 6–23 Reference Drawings 6 - 25 1 2 3 4 5 E . C . N. REV 264 M 279 316 361 ADDED TO PWB (200922-PWB-D IN LOCATION SHOWN, AND DEPICTED ON COMPONENT MAP. F C23 6 C24 7 REVISION HISTORY DESCRIPTION 8 APPROVALS CHK CM DATE DWN PRODUCTION RELEASE 12-10-03 DW DW DP PE N XU1 WAS 200479-TERM-10 01-29-04 DW DW MH O PWB CHG'D TO REV. C 06-14-04 DW DW DP P PWB CHG'D TO REV. D 03-22-05 DW DW DP F .01 .01 R5 OPEN XU1 MHW6342T C4 OPEN R18 C8 OPEN R7 OPEN 0 IN GND GND N/C VCC N/C GND GND OUT 3 C1 2 1 .01 1 R2 2 R1 OPEN T1 R6 OPEN C3 .01 R17 51 VR1 OPEN 1 Vout GND Vin E L2 OPEN L1 33uH 3 +5V C10 10pF L3 C11 36pF C12 36pF C13 5pF C14 27pF C6 0.01 C22 OPEN C21 OPEN C9 OPEN FOR FM30: 20VDC INPUT APPLIED HERE. FOR FM100 AND FM250: 18V C18 OPEN FOR FM500: 20V R16 OPEN 2 D D G 3 OPEN R3 OPEN C2 OPEN C5 22 S R4 OPEN Q1 BLF245 1 2 3 4 5 6 7 8 9 D2 OPEN J2 RF OUT P E D1 OPEN C15 680pF L5 23.2uH REV. J1 RF IN L4 10.4uH DWG. NO. Q43310-4 L6 OPEN C7 0.01 R8 * FOR FM30: FEED POINT FROM PWR. REGULATOR PWB. +24VDC J3 1 L7 OPEN R11 4.7K R12 R9 51 1/2W C D3 1N753A 6.2V C20 OPEN RT1 T 2.7K NTC OPEN C17 0.01 R13 OPEN C 8 C16 0.01 OPEN R10 10K J4 U2A 3 1 U2B 5 1 2 OPEN OPEN NOTE: 4 C19 OPEN 7 6 UNLESS OTHERWISE SPECIFIED: B FM30 OPEN OPEN FM100 FM250 2. ALL CAPACITORS ARE IN MICROFARADS. FM500 3 OHM 5W 3 OHM 5W 2.7 OHM 5W R15 OPEN INTERNATIONAL RADIO AND ELECTRONICS CORP. 25166 LEER DRIVE ELKHART, IN. 46514 574-262-8900 WWW.IREC1.COM APPROVALS J5 1 UNCONTROLLED UNLESS OTHERWISE MARKED IN RED INK BY CM AS A CONTROLLED COPY, COPIES OF THESE DOCUMENTS INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS ARE FOR REFERENCE ONLY. A B_L_SHT1_A.DOT REV. A 6 - 26 1 2 3 THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP. AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSION. 4 5 DWN CHK CM PE DW 08-28-03 DW 10-30-03 DP 10-30-03 DISTRIBUTION TITLE: SIZE FM RF DRIVER REV. DWG . NO . Q43310-4 B FILENAME: SCALE : NONE 6 B IREC 1. ALL RESISTORS ARE IN OHMS, 1/4 WATT +/- 5% TOL. R8 POWER LEVEL CONFIGURATION R14 7 A P PROJ NO. 533 SHEET 1 OF 1 8 FM30/FM100/FM250 User's Manual Mother Board J 403 6 5 4 3 2 1 HD561 Ribbon V+ Temp Gnd HD 502 HD701 HD503 3 2 1 FM500 Chassis Wiring C.Donner 2-23-98 CROWN BROADCAST Ribbon Cable 6 5 4 3 2 1 HD702 Ribbon J 602 FM500 CHASSIS WIRING 6 5 4 3 2 1 HD505 Metering Board HD504 P1 Unreg Voltage Regulator Board J 601 Display Board Reflectometer Feed-Thru HD1202 1 2 3 4 5 6 BNC Temp Sensor 8 9 44 45 46 47 DC DC Bus 31 32 33 67 68 69 35 36 71 72 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 P804 P806 P801 28 29 Socket 10 9 8 7 6 5 4 3 2 1 Bus 52 53 54 55 56 57 62 63 64 65 P3 Header P802 BNC 20 VAC P3 Left Power Regulator Board P803 P2 40 41 42 P807 WHT / BLK PA RF Output + 4 5 6 22 23 24 25 57 VAC Bridge Rectifier 37 38 17 18 19 20 PA 2 DC Input BLU / WHT RED WHT Driver DC Input Outer Fans Power Transformer 1 2 12 13 14 15 PA 1 DC Input Inner Fan Ribbon Cable J1 Back view Driver input P1 120 VAC P805 P808 Power Amp Interconnect Board RED / WHT P804 P801 P807 RF Output Filter & Reflectometer Board P806 P802 RF In P803 RF Out P805 P808 Right Power Regulator Board 57 VAC 100 VAC BLK BLU On BRN / WHT 12.5 VAC Carrier Switch BRN Off A Gnd B C P5 A * P4 Wht Brn Red/Wht S1A S1B On Brn/Wht Blk/Wht 120V 240V * 100V 220V P1 Fan Red Blk Gnd D P7 AC Input, Fuse, & Filter Blk Red D * P6 AC Power Switch Off AC Distribution Board *Jumpered for 120VAC CHASSIS WIRING 6–26 FM500 User's Manual Illustration 6–16 Receiver Board Reference Drawings 6–27 Receiver 6–28 FM500 User's Manual Section 7—Service and Support We understand that you may need various levels of support or that the product could require servicing at some point in time. This section provides information for both of these scenarios. Service and Support 7–1 7.1 Service The product warranty (see opposite page) outlines our responsibility for defective products. Before returning a product for repair or replacement (our choice), call our Customer Service department using the following telephone number: (866) 262-8917 Our Customer Service Representative will give you further instructions regarding the return of your product. Use the original shipping carton or a new one obtained from Crown. Place shipping spacers between the slide-out power amplifier assembly and the back panel. Please fill out the Factory Service Instructions sheet (page 7–5) and include it with your returned product. 7.2 24–Hour Support In most instances, what you need to know about your product can be found in this manual. There are times when you may need more in-depth information or even emergency-type information. We provide 24–hour technical assistance on your product via a toll telephone call. For emergency help or detailed technical assistance, call (866) 262-8917 You may be required to leave a message at this number but your call will be returned promptly from our on-call technician. 7.3 Spare Parts To obtain spare parts, call Crown Broadcast Sales at the following number. (866) 262-8917 You may also write to the following address: Service Manger International Radio and Electronics Company, Inc. 25166 Leer Drive Elkhart, Indiana, U.S.A. 46514-5425 7–2 FM500 User's Manual Three-Year Limited Warranty North America Only SUMMARY OF WARRANTY We, Crown Broadcast, a business unit of International Radio and Electronics Company, Inc., 25166 Leer Drive, Elkhart, Indiana 46515–2000 warrant to the ORIGINAL PURCHASER of a NEW Crown Broadcast product, for a period of three (3) years from the date of purchase by the original purchaser (the “warranty period”) that the new Crown Broadcast product is free of defects in materials and workmanship and will meet or exceed all advertised specifications for such a product. This warranty does not extend to any subsequent purchaser or user, and automatically terminates upon sale or other disposition of our product. ITEMS EXCLUDED FROM THIS CROWN BROADCAST We are not responsible for product failure caused by misuse, accident, or neglect. This warranty does not extend to any product on which the serial number has been defaced, altered, or removed. It does not cover damage to loads or any other products or accessories resulting from Crown Broadcast product failure. It does not cover defects or damage caused by use of unauthorized modifications, accessories, parts, or service. WHAT WE WILL DO We will remedy any defect, in material or workmanship (except as excluded), in our sole discretion, by repair, replacement, or refund. If a refund is elected, then you must make the defective or malfunctioning component available to us free and clear of all liens or other encumbrances. The refund will be equal to the actual purchase price, not including interest, insurance, closing costs, and other finance charges less a reasonable depreciation on the product from the date of original purchase. Warranty work can only be performed at our authorized service centers or at our factory. Expenses in remedying the defect will be borne by Crown Broadcast, including two-way surface freight shipping costs within the United States. (Purchaser must bear the expense of shipping the product between any foreign country and the port of entry in the United States and all taxes, duties, and other custom’s fee(s) for such foreign shipments.) HOW TO OBTAIN WARRANTY SERVICE You must notify us of your need for warranty service not later than ninety (90) days after the expiration of the warranty period. We will give you an authorization to return the product for service. All components must be shipped in a factory pack or equivalent which, if needed, may be obtained from us for a nominal charge. Corrective actions will be taken within a reasonable time of the date of receipt of the defective product by us. If the repairs made by us are not satisfactory, notify us immediately. DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES You are not entitled to recover from us any consequential or incidental damages resulting from any defect in our product. This includes any damage to another product or products resulting from such a defect. WARRANTY ALTERATIONS No person has the authority to enlarge, amend, or modify this warranty. The warranty is not extended by the length of time for which you are deprived of the use of the product. Repairs and replacement parts are provided under the terms of this warranty shall carry only the unexpired portion of this warranty. DESIGN CHANGES We reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes in products previously manufactured. LEGAL REMEDIES OF PURCHASER There is no warranty which extends beyond the terms hereof. This written warranty is given in lieu of any oral or implied warranties not contained herein. We disclaim all implied warranties, including without limitation any warranties of merchantability or fitness for a particular purpose. No action to enforce this warranty shall be commenced later than ninety (90) days after expiration of the warranty period. Crown Broadcast, International and Radio Company, Inc. 25166 Leer Drive, P.O. Box 2000, Elkhart, Indiana 46515–2000 Revised August 2001 Service and Support 7–3 Notes: 7–4 FM500 User's Manual Factory Service Instructions To obtain factory service, complete the bottom half of this page, include it with the unit, and ship to: International Radio and Electronics Company, Inc. 25166 Leer Drive Elkhart, Indiana, U.S.A. 46514-5425 For units in warranty (within 3 years of purchase from any authorized Crown Dealer): We pay for ground UPS shipments from anywhere in the continental U.S. and Federal Express Second Day service from Hawaii and Alaska to the factory and back to you. Expedited service/shipment is available for an additional charge. You may ship freight collect (COD for cost of freight) or forward your receipt for shipping charges which we will reimburse. We do not cover any charges for shipping outside the U.S. or any of the expenses involved in clearing customs. If you have any questions about your Crown Broadcast product, please contact Crown Broadcast Customer Service at: Telecphon: (574) 262-8900 Fax: (574) 262-5399 Name: Company: Shipping Address: Phone Number: Model: Fax: Serial Number: Purchase Date: Nature of the Problem (Describe the conditions that existed when the problem occurred and what attempts were made to correct it.) Other equipment in your system: If warranty has expired, payment will be: Card Number: Cash/Check VISA Please Quote before servicing Exp. Date: Service and Support Mastercard COD Signature: 7–5 Appendix Transmitter Output Efficiency FM500 User's Manual Appendix–1 Transmitter efficiency output RF Power Output Efficiency-FM500 PADC Volts PADC Amps RF Power Efficiency 51.3 13.91 550 77% 48.3 13.29 500 78% 45.5 12.74 450 77% 42.7 12.14 400 77% 39.4 11.46 350 78% 36.0 10.68 300 78% 33.0 10.00 250 76% 29.6 9.25 200 73% 25.4 8.28 150 71% 21.1 7.29 100 65% Power measurements were made at 97.1 MHz. Voltage and current measurements were taken from the unit's built-in metering. The accuracy of the internal metering is better than 2%. Return loss of the RF load was greater than -34dB at test frequency. Appendix–2 FM500 User's Manual A B C Glossary The following pages define terms and abbreviations used throughout this manual. Glossary G–1 A B C AF Audio Frequency; the frequencies between 20 Hz and 20 kHz in the electromagnetic spectrum. ALC Automatic Level Control AM Amplitude Modulation; the process of impressing information on a radio-frequency signal by varying its amplitude. bandwidth The range of frequencies available for signalling. BCD Binary-Coded Decimal; a digital system that uses binary codes to represent decimal digits. BFO Beat Frequency Oscillator BNC A bayonet locking connector for miniature coax; said to be short for Bayonet-Neill-Concelman. broadband As used in the FM transmitter, refers to the entire audio spectrum as opposed to the spectrum influenced by the pre-emphasis; also called "Wideband." carrier A continuous signal which is modulated with a second, information-carrying signal. crosstalk In FM broadcasting, this term generally refers to the interaction between the main (L+R) and the subcarrier (L–R) signals as opposed to "separation" which generally refers to leakage between left (L) and right (R) channels. density (program) A high average of modulation over time. deviation The amount by which the carrier frequency changes either side of the center frequency. DIP Dual In-line Pins; term used to describe a pin arrangement. distortion The unwanted changes in signal wave shape that occur during transmission between two points. DPM Digital Panel Meter EPROM Erasable Programmable Read Only Memory ESD Electrostatic Discharge; a discharge that is potentially destructive to sensitive electronic components. G–2 FM500 User's Manual exciter FET (1) A circuit that supplies the initial oscillator used in the driver stage. (2) A transmitter configuration which excludes stereo generation and audio processing. Field-Effect Transistor frequency synthesizer A circuit that generates precise frequency signals by means of a single crystal oscillator in conjunction with frequency dividers and multipliers. FM Frequency Modulation; the process of impressing information on a radio signal by varying its frequency. FSK Frequency Shift Keying; an FM technique for shifting the frequency of the main carrier at a Morse code rate. Used in the on-air identification of frequencies. gain reduction The process of reducing the gain of a given amplifier. harmonics Undesirable energy at integral multiples of a desired, fundamental frequency. HF Hight Frequency; Frequencies in the 3.0 to 30.0 MHz range. Highband Frequencies affected by the pre-emphasis. I/O Input/Output LED Light-Emitting Diode modulation The process by which a carrier is varied to represent an information-carrying signal. MOSFET Metal Oxide Semiconductor Field Effect Transistor; a voltage-controlled device with high input impedance due to its electrically isolated gate. nearcast A transmission within a localized geographic area (ranging from a single room to a several kilometers). PA Power Amplifier Glossary G–3 A B C PAI Power Amplifier Current PAV Power Amplifier Voltage pilot A 19–kHz signal used for stereo transmissions. pre-emphasis The deliberate accentuation of the higher audio frequencies; made possible by a high-pass filter. processing The procedure and/or circuits used to modify incoming audio to make it suitable for transmission. receiver An option which adds incoming RF capability to an existing transmitter. See also "Translator." RF Radio Frequency; (1) A specific portion of the electromagnetic spectrum between audiofrequency and the infrared portion. (2) A frequency useful for radio transmission (roughly 10 kHz and 100,000 MHz). SCA Subsidiary Communications Authorization; see "subcarrier." S/N Signal to Noise spurious products Unintended signals present on the transmission output terminal. stability A tolerance or measure of how well a component, circuit, or system maintains constant operating conditions over a period of time. stereo pilot See "pilot." stereo separation The amount of left-channel information that bleeds into the right channel (or vice versa). subcarrier A carrier signal which operates at a lower frequency than the main carrier frequency and which modulates the main carrier. suppression The process used to hold back or stop certain frequencies. G–4 FM500 User's Manual SWR Standing-Wave Ratio; on a transmission line, the ratio of the maximum voltage to the minimum voltage or maximum current to the minimum current; also the ratio of load impedance to intended (50 ohms) load impedance. THD Total Harmonic Distortion translator A transmitter designed to internally change an FM signal from one frequency to another for retransmission. Used in conjunction with terrestrial-fed networks. satellator A transmitter equipped with an FSK ID option for rebroadcasting a satellite-fed signal. VSWR Voltage Standing-Wave Ratio; see "SWR." Wideband See "broadband." VCO Voltage-Controlled Oscillator Glossary G–5 Index Symbols 19–kHz level adjustment 5–3 phase adjustment 5–3 A AC. See power: input ALC 3–3, 3–8, 4–8 altitude operating range 1–8 amperes PA DC 3–3, 3–8 amplifier reference drawings 20 RF 4–13 bias set 5–6 antenna 2–9 mismatch 3–3 applications 1–3 audio broadband 3–5 distortion 5–9 frequency 5–9 high 3–5 input connectors 4–3 input level 3–5 monitor connections 2–12, 4–5 performance 5–7 pre-emphasized 3–5 processing 3–5, 4–9 wide 3–5 audio processor 3–6 adjustments 5–2 board location 4–3 bypass 2–11, 2–12, 4–9 circuit description 4–3 indicators 3–5 input 3–5 reference drawings 6–4 B backup transmitter use 1–4 bandwidth RF 5–8 battery. See power: input Bessel nulls 5–9 bias set 5–6 booster transmitter use 1–4 broadband. See audio: broadband bypass audio processor 2–12, 4–9 C cables audio input 2–10 carrier 4–9, 5–8 automatic turnoff 2–13, 3–8, 5–6, 5– 10 frequency 5–8, 5–10 carrier switch 3–4, 5–5 Channel. See frequency channel. See frequency main 5–10 main into sub 5–10 sub into main 5–10 chassis circuit 4–13 circuit boards audio processor 4–3, 6–4 display 14 metering 10 motherboard 12 power regulator 18 RF exciter 8 stereo generator 4–5, 6 voltage regulator 16 circuits chassis 4–13 display 4–10 metering 4–8 motherboard 4–9 part numbering 4–2 power regulator 4–12 RF exciter 4–6 stereo generator 4–4 voltage regulator 4–11 components numbering 4–2 composite input 2–11 input connection 2–11 output Index–1 adjustment 5–3 connectors audio input 2–10 audio monitoring 2–12 composite in 2–11 remote I/O 2–11, 2–13 RF input 2–9 RF output 2–9 RF output monitoring 2–9 SCA In 2–11 XLR 2–11, 4–3 cooling fan 3–2 control 4–9 coverage area 1–4 crosstalk 1–7 measurements 5–9 current limit PA 5–5 D DC. See power: input de-emphasis 2–12, 5–2, 5–7 jumpers 2–12 delay program failure to carrier turnoff 2– 13, 5–6 dimensions 1–8 DIP socket 2–10, 4–9 display circuit description 4–10 front panel 3–2, 3–5, 3–7 modulation calibration 5–6 display board reference drawings 14 distortion 1–7 audio 5–9 harmonic 4–5 E emissions 5–8 exciter. See RF exciter configuration 1–4 F fan control 4–9 fault indicators 4–10 input 3–8 lock 3–8 power 3–8 servicing 3–8 SWR 3–8 Index–2 temperature 3–8 FCC guidelines 1–8, 5–8, 5–10 filter RF output 22 frequency carrier 5–8, 5–10 measurement 5–4 pilot 5–8 receiver 2–7 response 5–9 selection 2–5, 5–4 receiver 2–7 samples 2–6 synthesizer 5–10 frequency synthesizer. See RF exciter adjustments 5–4 front panel display modulation calibration 5–6 FSK 1–5, 1–6 measurement 5–4 G gain control 3–5 gain reduction 4–4 gain switches input 3–6 H harmonic distortion 4–5 harmonics 5–8 heatsink 3–8 highband 3–5 processing 4–4 humidity operating range 1–8 I I/O connector 1–2, 2–13 pinout 2–13 indicators audio processor 3–5 fault 3–8, 4–10 highband 3–5 LED 3–5, 3–7, 4–10 pilot 3–5 wideband 3–5, 5–6 input audio connections 2–10 composite 2–11 fault 3–8 gain switches 3–5 program fault 2–13 SCA connection 2–11 FM500 User's Manual L labels 1–10 LEDs 3–5, 4–10 line voltage 2–3 lock status 4–7 lock fault 3–8 M metering 1–2 circuit description 4–8 metering board adjustments 5–5 location 4–8, 4–15 reference drawings 10 modulation 2–11, 3–5, 5–3, 5–7, 5–8 calibration 5–6 compensator 2–6 display 3–5 percentage 3–5, 5–9 monitor audio 2–12, 4–5 mono operation 2–11, 3–6 motherboard circuit description 4–9 reference drawings 12 multimeter 3–7 front panel 3–3 N networks satellite-fed 1–6 terrestrial-fed 1–5 noise 1–7, 3–8 measurements 5–9 O operating environment 1–8, 2–2 options 1–3, 1–4, 1–6 output power 1–7, 3–7 display 3–7 output filter 4–14 P pilot indicator 3–5 power AC supply 4–13 AC voltage selection 2–3 amplifier reference drawings 20 fault 3–8 input 1–8, 2–3 FCC guidelines 5–10 output 1–3, 1–7, 5–8 display 3–7 output filter 4–14 regulator circuit description 4–12 RF 3–3, 3–7 RF amplifier 4–13 transformer 4–13 power regulator board reference drawings 18 power switch 3–4 pre-emphasis 1–7, 4–4, 5–2, 5–7 curve 2–12 networks 4–3 processing audio 2–12, 3–5 control 3–6 control setting 3–2 highband 3–5, 4–4 processor audio bypass 2–12 program failure 2–13, 5–10 program source 2–10, 3–6 R receiver frequency selection 2–7 option 1–5 specifications 1–9 reflectometer 4–14, 22 regulatory approvals 1–8 remote control 1–2 remote I/O connector 2–13 pinout 2–13 remote operation 2–13 repair warranty 7–3 part numbering 4–2 parts spares 7–2 performance checklist 5–7 tests 5–10 pilot frequency 5–8 Index–3 R (continued) RF amplifier 4–13 bias set 5–6 bandwidth 1–8, 5–8 exciter 2–5, 2–11 board location 2–5, 4–6 circuit description 4–6 reference drawings 8 input 1–5, 2–9 output 1–2, 1–5, 1–7, 3–3, 3–7 impedance 1–7 output filter 4–14, 22 tuning 2–7 S safety 1–10 satellator transmitter use 1–6 SCA 1–5 input connection 2–11 sensitivity monaural 1–9 stereo 1–9 separation stereo 1–7 stereo generator 5–3 service warranty 7–3 Service Instructions 7–5 specifications receiver 1–9 transmitter 1–7 stand-alone transmitter use 1–4 stereo separation 1–7, 5–9 stereo generator 1–2, 2–12 adjustments 5–3 board location 4–5 bypassing 2–11 circuit description 4–4 reference drawings 6 subcarrier 5–10 38–kHz 5–10 suppression subcarrier 1–7 switches carrier 3–2, 3–4, 5–5 input gain 3–5, 3–6 Normal-Bypass 2–12, 4–9 power 3–4 receiver 2–7 stereo-mono 3–2, 3–6 Index–4 SWR 3–7 calibrate 5–5 fault 3–8 SWR fault 4–9 synchronization 4–11 synthesizer. See RF exciter T temperature fault 3–8, 4–9 operating range 1–8, 5–10 PA 3–3, 3–8 test point voltage 3–8 tests performance 5–7, 5–10 time-out program input failure 2–13 transformer 4–13 translator transmitter use 1–5 V VCO 4–6 voltage AC selection 2–3 voltage regulator 3–8 adjustments 5–6 circuit description 4–11 reference drawings 16 voltage selection 2–3 voltmeter display 3–8 volts PA DC 3–3, 3–8 VSWR 1–2, 2–9 W Warranty 7–3 weight 1–8 wideband 3–5, 5–6 X XLR connectors 2–10 FM500 User's Manual