Base Unit Connectors; Test Functions; Modulator (Dual If) - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Introduction
1.4.3

Base Unit Connectors

Alarm Connector
Unit Management
Tx & Rx IF Connectors
L-Band Monitor
Traffic Data Interface
1.4.4

Test Functions

Data Test Pattern
CW
SSB Carrier
Loopback
1.4.5

Modulator (Dual IF)

70 / 140 MHz
Impedance / Connector
Output Power
Power Accuracy
L-Band
Impedance / Connector
Output Power
Power Accuracy
L-Band Monitor
Port Impedance
Port Connector
Port Level
Port Isolation
Monitor Frequency
Harmonics and Spurs
External Tx Carrier Off
Quadrature Phase Error and
Amplitude Imbalance
Spectral Inversion
Carrier Phase Noise
BUC 10 MHz Reference
DB-15 male: Form C; Tx, Rx and unit faults; External Tx Carrier Off; IQ test point
• DB-9 male with EIA-232 and RS 485 2W/4W
• RJ-45 Ethernet (Maximum Ethernet packet size 1536 bytes including Ethernet header & CRC)
• 70/140 MHz: BNC
• L-Band: Type 'N' female
Type 'SMA' female
• 2X RJ45 10/100/1000 BaseT Ethernet
• 1X Optical Gigabit Ethernet (optional)
Note: All Data Gig-E interfaces have a maximum Ethernet packet size of 1632 bytes including Ethernet
header & CRC
2^10-1, 2^15-1 and 2^23-1 compatible with BERT on applicable interfaces
Modulation disabled and CW signal is transmitted
Provides suppressed carrier and suppressed sideband
Full Duplex only
50 to 180 MHz in 100 Hz steps, maximum symbol rate is within IF limits
75 Ω / BNC Female. Return Loss ≥ 18 dB
0 to -20 dBm, 0.1 dB steps (70/140 MHz)
±0.5 dB of nominal at 25°C. Within ±0.5 dB from 25°C value at same frequency
950-2150 MHz in 100 Hz steps, modulator maximum symbol rate is within IF limits
50Ω, Type N Female. Return Loss ≥ 15 dB
-5 to -40 dBm, 0.1 dB steps
±0.5 dB of nominal at 25°C, ±0.5 dB from 25°C value at same frequency
50 Ω (available in modulator only or modem configuration)
SMA Female
-27 dBm ± 3dBm
20 dB min
70/140 MHz: 900+70/140 MHz, L-Band: same.
< 60 dBc/4kHz, modulated carrier. Excludes spectral mask area.
TTL Low signal
Sideband 35 dB below unmodulated carrier
Normal or Inverted
Frequency Offset
10 Hz
100 Hz
1 kHz
Frequency Offset
10 Hz
100 Hz
1 kHz
dBc/Hz Frequency Offset
-36 10 kHz
-66 100 kHz
-76 1 MHz
dBc/Hz Frequency Offset
-105 10 kHz
-125 100 kHz
-138
1–12
Revision 2
MN-CDM750
dBc/Hz
-86
-96
-96
dBc/Hz
-148
-150