Specifications

Introduction SDM-100A Satellite Modem
1–6 Rev. 0
Additional Modulator Specifications
Output Power -5 to -30 dBm, adjustable in 0.1 dB steps.
Output Spurious and Harmonics -55 dBc in 4 kHz BW in-band (50 to 180 MHz).
-55 dBc in 4 kHz BW out-of-band (0 to 500 MHz).
Output Impedance 75Ω standard, or 50Ω optional.
Output Return Loss 20 dB.
Output Frequency Stability ± 10 PPM.
Data Clock Source Internal or external.
External clock,
± 100 PPM and < 5% jitter.
Internal Data Clock Stability ± 10 PPM.
Additional Demodulator Specifications
Input Power (Desired Carrier) -30 to -55 dBm (composite).
+30 dB power within 2 MHz from desired carrier.
+40 dB power outside of 2 MHz from desired carrier.
-5 dBm maximum composite.
Input Impedance 75Ω standard, or 50Ω optional.
Input Return Loss 20 dB.
Carrier Acquisition Range ± 25 kHz minimum.
Clock Acquisition Range ± 100 PPM.
Acquisition Time < 1 second typical at 64 kbit/s.
Directed Sweep:
Sweep Range 0 to 70000 Hz.
Sweep Center -35000 to +35000 Hz.
Remote Control Specifications
Serial Interface RS-232-C or RS-485, Baud Rate 110 to 19,200 bit/s.
Protocol not necessarily compatible with SDM-650B or
SDM-308B.
Signals Controlled/Monitored Transmit Frequency.
Receive Frequency.
Transmit Power.
Transmitter On/Off.
Data Rate Select.
IF Loopback.
RF Loopback.
Baseband Loopback.
Scrambler On/Off.
Descrambler On/Off.
Sweep Range.
Sweep Center.
Filter Mask.
Raw Error Rate.
Corrected Bit Error Rate.
Receive E
b
/N
0
.
TX Clock Internal/External.
RX Clock Normal/Invert.
Receive Signal Level.
Receive Carrier Detect.
Power Supply Voltages.
Fault Status.
Stored Fault Status.
Configuration Retention Will maintain current configuration for up to one year
minimum without power.
Addressing Programmable to 1 of 255 possibilities.
Address 0 reserved for global addressing.
Local control of all remote functions included via push-button entry.