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Comtech EF Data CDM-Qx Multi-Channel Satellite Modem

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  • DoubleTalk Carrier-in-Carrier
  • Four slot chassis
  • Data Rates 32 kbps to 20 Mbps
  • Spectrum Analyzer Function


SKU: SATRES-3760

System Specifications
Data Rate

(See Summary Table)
32 kbps to 20 Mbps, in 1 bps steps

(data interface dependant)
Symbol Rate Up to 10 Msps
Scrambling V.35, or synchronous
FEC

(See Summary Table)
Viterbi 1/2, 3/4 and 7/8

Concatenated Reed-Solomon 1/2, 2/3, 3/4, and 7/8
Turbo Product Coding Hardware option
(TPC) - 2nd Generation BPSK Rate 5/16 and 21/44

QPSK Rate 21/44, 3/4, 7/8, and 17/18

8-PSK Rate 3/4, 7/8, and 17/18

16-QAM Rate 3/4 and 7/8
M&C Interface EIA-232, EIA-485 (2- or 4-wire), 10/100 BaseT Ethernet with SNMP, HTTP and Telnet support
Form C Relays Tx, Rx traffic alarms and Unit faults
External Reference 1, 2, 5, 10 or 20 MHz, BNC Connector
IF Impedance &

Connectors
CDM-Qx: 75O (Optional 50O), BNC female

CDM-QxL: 50O, Type-N female
Monitor Functions Eb/N0, Frequency Offset, BER, Buffer fill status, Rx signal level, Carrier Power Ratio
Modulator
Frequency Range CDM-Qx: 50 to 90, 100 to 180 MHz

CDM-QxL: 950 to 1950 MHz 100 Hz frequency resolution (both)
Frequency Stability CDM-Qx: ± 1.0 ppm (standard), ± 0.1 ppm (optional), 0 to 50ºC (32 to 122ºF) CDM-QxL: ± 0.1 ppm, 0 to 50ºC (32 to 122ºF)
Harmonics and Spurious <-55 dBc/4 kHz (Typically <-60 dBc/4 kHz)
Transmit On/Off Ratio 55 dB minimum
Phase Noise < 0.75 degrees RMS double-sided, 100 Hz to 1 MHz
Output Power (per Modulator) CDM-Qx: -5 to –25 dBm, 0.1 dB step

CDM-QxL: -5 to –45 dBm, 0.1 dB step
Power Accuracy ± 1 dB over frequency and temperature
External Carrier Off By TTL low signal
BUC FSK

Communications
CDM-QxL: Via Tx center conductor with FSK capable BUCs
BUC Power Supply CDM-QxL: None, 24 VDC, 48 VDC (option)
Demodulator
Frequency Range CDM-Qx: 50 to 90, 100 to 180 MHz

CDM-QxL: 950 to 1950 MHz

100 Hz frequency resolution (both
Input Power CDM-Qx:

-15 to –45 dBm, ≤ 2.048 Msps

-15 to –40 dBm, > 2.048 Msps ≤ 4.096 Msps

-15 to –35 dBm, > 4.096 Msps

CDM-QxL:

-130 + 10log(Symbol Rate) dBm (minimum)
Automatic Gain Control CDM-QxL: 50 dB
Max Composite Level +76 - 10log(Symbol Rate) dBc within 10 MHz of desired carrier

CDM-QxL: +87 - 10log(Symbol Rate) dBc (Broadband), +76 - 10log(Symbol Rate) dBc within 10 MHz of desired carrier, -5 dBm absolute maximum
Acquisition Range CDM-Qx: ±1 to ± 32 kHz, programmable, in 1 kHz steps (Symbol Rate > 64 ksps)

±1 to ± (SR/2) kHz, programmable, in 1 kHz steps (Symbol Rate ≤ 64 ksps)

CDM-QxL: ±1 to ± 200 kHz, programmable, in 1 kHz steps (Symbol Rate > 625 ksps)

±1 to ± 32 kHz, programmable, in 1 kHz steps (64 ksps < Symbol Rate < 625 ksps) ±1 to ± (SR/2) kHz, programmable, in 1 kHz steps (Symbol Rate ≤ 64 ksps)
Receive Buffer 512, 1024, 2048, 4096, 8182, or 16384 bits
Receive Clock Options Rx Satellite, Tx Terrestrial, External Reference
Clock Tracking ± 100 ppm minimum
LNB Voltage CDM-QxL: Off, 13 VDC or 18 VDC, 500 mA (max)
DoubleTalk Carrier-in-Carrier
Minimum Symbol Rate 256 ksps
Propagation Delay 0 to 330 ms
Max Symbol Rate Ratio

(See Whitepaper)
3:1 (Tx:Rx or Rx:Tx)
Max Power Ratio

(See Whitepaper)
Tx Carrier Power (Interferer) – Rx Carrier Power (Desired), in dB, < 10 dB (except for 16-QAM, TPC, R=7/8)

Tx Carrier Power (Interferer) – Rx Carrier Power (Desired), in dB, < 7 dB (16-QAM, TPC, R=7/8)
Satellite Restrictions Satellite in “loop-back” mode (i.e. Tx station must be able to receive itself)

“Non-processing” satellite (i.e. does not demodulate/remodulate the signal)
Data Interfaces
EIA-422 32 kbps to 12 Mbps, DB-25F
V.35 32 kbps to 12 Mbps, DB-25F
HSSI 32 kbps to 20 Mbps, 50-pin, mini-D (F)
G.703 T1/E1 (Balanced) DB-15F, 120 Ω
G.703 T1/E1 (Unbalanced) BNC, 75 Ω
G.703 E2 (Unbalanced) BNC, 75 Ω
Quad G.703 E1 (Balanced) 4 x RJ-45, 120 Ω

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