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Download RC-850 Hardware Reference Manual Version 3
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Hardware Reference Manual Appendixm AdjustDlents The RC-850 Repeater Controller may require several adjustments to be made upon initial installation (Chapter 2) or when adding links or additional audio sources. This chapter describes these normal user adjustments. plus factory adjustments which should not be changed unless it becomes necessary due to replacement of components or accidental misadjustment. User Adjustments Adjustment of the audio level into the audio delay line on the main controller board (Rl13) is described in Chapter 2 - Initial Installation - Setting Audio Levels. Proper adjustment of this pot is important for best audio signal- to nOise ratio through the controller. Additional audio level adjustments are available for Spare Audio and Link Receiver audio inputs. The relative levels of the other internal audio sources (tone. speech. etc.) may also be adjusted with level control pots. Assuming that Rl13 has been adjusted as described in Chapter 2, pots RIOS through Rl12 should be adjusted for consistent levels. approximately four volts peak-to-peak, at the transmitter audio mixer output (TX). If your repeater transmitter requires low level audio input. do not use these pots as a transmitter audio level adjustment - you will degrade the audio signal-to-noise performance. Knock down the audio level at the transmitter or reduce the transmitter's input sensitivity. Pots RI02 through RI04 should be adjusted for consistent levels into the phone line. The levels for the internal audio sources are preset at the factory and may require only slight readjustment. The proper spare and link audio level settings are dependent on the input levels provided to the controller. so these will most likely need adjustment when audio sources are installed. The table below lists the functions of the user adjustable audio level pots. The multi-tum audio level pots may be accessed by.removing the four front panel screws and pulling out (gently) the front panel. The pots are then accessible from the front of the unit. Be careful not to pinch front panel wires when remounting the front panel on the unit. Audio Level Adjustment Pots - Main Controller Board Pot Description Pot Description R105 R106 R107 R108 R109 Tone generator level to tx Speech synth. I local mic level to tx Phone level to tx Control receiver I Link 4 level to tx Spare AudiO 1 I Link 3 level to tx Link 2 level to tx Link 1 level to tx Repeater receiver level to tx Repeater receiver level to audio delay line R102 R103 R104 Tone generator level to phone Speech synthesizer level to phone Repeater receiver level to phone RIIO RIll Rl12 Rl13 (Adjustments) (see Chapter 2) Appendix III - 1 8/87 V3
