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Comtech EF Data SDM-8000 Satellite Modem

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  • Data Rates 9.6 kbps to 9.312 Mbps
  • Closed Network
  • 8PSK and 16QAM Modulation


System Specifications
Operating Frequency Range50 to 180 Mhz, in 2.5 kHz steps
Digital Interface (Standard)G.703, MIL-188/EIA-422, and V.35 selectable
Digital Data Rate4.8 Kbps to 9.312 Mbps, in 1 bps steps
Symbol Rate6.0 ks/s to 6.3 Ms/s
Modulation TypeBPSK, QPSK, 8PSK, and 16QAM
Stability5, 10, or 20 MHz at +5 dBm external reference, ±1 x 10-5 internal reference
Energy DispersalCCITT, V.35, and others
Modulation Specifications
Output Power-5 to -30 dBm, adjustable in 0.1 dB steps (+5 to -20 dBm optional)
Spurious-55 dBc, measured in a 3 KHz bandwidth
Output Return Loss20 dB
Output ConnectorBNC
Output Impedance75 Ohms 50 (Ohms optional)
Demodulation Specifications
Input Power:

  Desired Carrier

-30 to -55 dBm (< 2 Mbps)

-30 dBm to -45 dBc (> 2 Mbps)
Input Power:

  Maximum Composite

-5 dBm or +40 dBc
Input Impedance75 Ohm (Optional 50 Ohm)
Input Return Loss20 dB
Carrier Acquisition Range±30 kHz, selectable
Input ConnectorBNC
Elastic Buffer32 to 262,144 bits, selectable
Environmental and Physical
Prime Power90 to 264 VAC, 47 to 63 Hz, 130W

38 to 64 VDC, 80W typical, 130W maximum
Size19W x 20D x 3.5H inches (2RU)

(48W x 51D x 9H cm)
Weight< 19 lbs. (8.6kg)
Mounting19 inch rack
Temperature0 to 50°C (32° to 122°F) Operating

-40° to +70°C (-40° to +158°F) Storage
Humidity< 95%, non-condensing
ESC Specifications

  Voice/Orderwire Data

  Data Orderwire

  Backward Alarm

  Total Overhead

2 ADPCM (input: 4-wire VF), or 64 kbit/s data

8 kbit/s (EIA-422 interface)

Form C contacts (4)

96 kbit/s

  ASYNC Data Orderwire

  Backward Alarm

  Total Overhead

1/2000 x data rate

Form, C contacts

1/15 x data rate

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