Download Comtech EF Data SDM-650B Specifications

SDM-300L3 Satellite Modem
Specifications
15.4
Revision 0
MN/SDM300L3.IOM
Demodulator Specification Summary
Table 15-3. Demodulator Specification
Receive Specifications
Input Connector
Input Impedance
Input Return Loss
Minimum Input Level, Desired Carrier
Input Level AGC
Input Composite Power:
Symbol Rate
> 64 Ksym/s
< 64 Ksym/s
Absolute maximum
Acquisition Range
BER Performance
(BER vs Eb/N0)
LNB 10 MHz Reference
LNB Voltage
LNB Current
LNB Band Control
Test Modes Pattern Monitor
Monitored Signals
Type F Female
75 Ω
≥ 10 dB
-135 dBm + 10*Log (Symbol Rate), see curve
50 dBc, see curve
+30 dBc within 10 MHz of desired
+40 dBc with respect to receive signal
+50 dBc with respect to receive signal
-5 dBm
± 500 kHz, programmable in 1Hz increments.
See BER performance tables
Notes: BER specified is for IF loop-back with added noise.
On center conductor of L-band input connector, selectable
ON/OFF. Level: -3 ± 3 dBm.
Source: 1. Internal High Stability Reference
2. REF EXT Supplied at 10 MHz
Performance: For phase noise, refer to L-Band Modulator 10
MHz. Frequency stability is the same as the modulator.
On center conductor of L-band input connector, selectable
ON/OFF: 13 and 18 volts per DiSEq 4.2 and 24 VDC at 500
mA, maximum
Programmable MIN and MAX current alarms
22kHz tone outbound from L-band connector per DiSEq 4.2.
Detects the presence of 2047 data pattern in RX stream and
reports BER.
Receive signal level
Raw BER
Corrected BER range 10-3 to 10-12
Eb/N0, 2.0 to 16.0 dB
Rx frequency offset –500 kHz to +500 kHz
Buffer fill status, 1 to 99% in 1% steps
15–5