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Comtech EF Data CDM-750 High-Speed Trunking Modem

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  • IP Trunking
  • High-speed content delivery
  • Carrier-in-Carrier
  • Emergency communications


SKU: SATRES-23175

CDM-750 System Specifications
Symbol/Date Rate Range Programmable in 1 sps increments
DVB-S2 QPSK 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9, 9/10 to 63 Msps / 112.6 Mbps max.

8-PSK 3/5, 2/3, 3/4, 5/6, 8/9, 9/10 to 63 Msps / 168.7 Mbps max.

16-APSK 2/3, 3/4, 4/5, 5/6, 8/9, 9/10 to 47 Msps / 167.6 Mbps max.

32-APSK 3/4, 4/5, 5/6, 8/9, 9/10 to 38 Msps / 169.2 Mbps max.
FEC Frame Normal (64,800 bits) or Short (16,200 bits)
Pilots On or Off
Alpha (Rolloff) 20%, 25% or 35%
Management Front panel keypad / display RS-232 /485, or 10/100Base-T with SNMP, Telnet, HTTP
Reflash Ethernet management port
Frequency Stability Internal, stability ± 0.06 ppm
External Reference Input / Output (BNC Female) Internal, 1, 2, 5 or 10, MHz for IF and Data, internally phase locked. Output: Off or internal 10 MHz
Form C Modulator, Demodulator and Unit fault
Spectral Sense Normal and Inverted
Configuration Retention Non-volatile memory; Returns upon power up
Modulator (Dual IF)
70 / 140 MHz 50 to 180 MHz in 100 Hz steps
Impedance / Connector 75 ohm, BNC Female. Return Loss ≥ 18 dB
Output Power 0 to -20 dBm, 0.1 dB steps (70/140 MHz)
Power Accuracy ± 0.5 dB of nominal at 25°C; Within ± 0.5 dB from 25°C value at same frequency
L-Band 950 to 2150 MHz in 100 Hz steps
Impedance / Connector 50 Ohm, Type N Female. Return Loss ≥ 15 dB
Output Power -5 to -40 dBm, 0.1 dB steps
Power Accuracy ± 0.5 dB of nominal at 25°C

± 0.5 dB from 25°C value at same frequency
L-Band Monitor Same as L-Band or 900 + 70/140 MHz IF at -27 dBm ± 3 dB
Harmonics and Spurs < 60 dBc/4kHz, modulated carrier; Excludes spectral mask area
External TX Carrier Off TTL Low signal
Quadrature Phase Error and Amplitude Imbalance Sideband 35 dB below unmodulated carrier
Demodulator (Dual IF)
70 / 140 MHz 50 to 180 MHz in 100 Hz steps
Impedance / Connector 75 ohm, BNC Female. Return loss 15 dB min.
Input Power Desired Carrier = -58 + 10Log (Symbol Rate in Msps) dBm min. and -18 dBm max.
Max. Composite Power The lesser of 20 dBc -10Log (Symbol Rate in Msps) or -3 dBm
L-Band 950-2150 MHz in 100 Hz steps
Impedance / Connector 50 ohm, Type N Female. Return loss 10 dB min
Input Power Desired Carrier = -65 + 10Log (Symbol Rate in Msps) dBm min. and -25 dBm max.
Maximum Composite The lesser of 30 dBc - (Normal Frame) 10Log (Symbol Rate in Msps) or -10 dBm
Doubletalk Carrier-In-Carrier
Delay Range 0 to 400 ms (factory default 230 - 290 ms)
CnC Ratio +7 dB to -7 dB Interferer to Desired
Es/No degradation (dB) QPSK: 0.7 dB

8-PSK: 0.9 dB

16-APSK: 1.5 dB

32-APSK: 2.0 dB
Symbol Rate Ratio Max 3:1 TX/RX or RX/TX
Satellite Configuration Transmit station sees own carrier. Non-processing satellite.
Base Unit Connectors
Alarm Connector (DB-15 Male) Form C: TX, RX and unit faults

External TX Carrier Off

IQ test point
Unit Management DB-9 Male with RS-232 and RS-485 2 W / 4 W RJ-45 Ethernet (Maximum Ethernet packet size 1536 bytes including Ethernet header & CRC)
TX & RX IF Connectors BNC-female (70 / 140 MHz)

Type-N female (L-Band)
L-Band Monitor SMA female
Traffic Data Interface 2 x RJ-45 10/100/1000Base-T Ethernet

1 x Optical Gigabit Ethernet (optional)

Note: All Data GigE interfaces have a maximum Ethernet packet size of 1632 bytes including Ethernet header & CRC
Test Functions
Data Test Pattern 2047 and 2^23-1 compatible with BERT on TX data on applicable interfaces
CW Modulation disabled and CW signal is transmitted
SSB Carrier Provides suppressed carrier and suppressed sideband
Loopback Full Duplex only
Environmental and Physical
Temperature

    Operating

    Storage


0 to 50ºC (32 to 122ºF)

-40 to 70ºC (-40 to 158ºF)
Humidity 95% maximum, non-condensing
Power Supply Input 100 to 240 AC 50/60 Hz
Power Consumption

    120 VAC at 60 Hz

    230 VAC at 50 Hz


88 W, 93 VA typical

88 W, 133 VA typical
Dimensions (1 RU) (H x W x D) 1.75" x 19" x 18.65" (48 x 47.4 x 4.4 cm)
Weight 15 lbs (6.8 kg)
AC Receptacles Includes restraint for standard IEC-320 inlet
Agency Compliance CE Mark and FCC part 15

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