Comtech EF Data CDM-570A - Manual (Page 68)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Rear Panel Connectors and Pinouts Revision 2
3–6
3.2.1 IF Connections Group
CAUTION – THERE MAY BE DC VOLTAGES PRESENT ON THE TYPE ‘N’ RX AND TX IF
CONNECTORS, UP TO A MAXIMUM OF 48 VOLTS.
CDM-570AL or CDMR-570AL: The IF port connectors are both 50Ω ‘N’ female types. The return
loss on these ports is greater than 17 dB (typically better than 20 dB). If there is a need to
connect to a 75Ω system, you may use an inexpensive ‘N’ to ‘F’ type adapter. While there will be
a reduction in return loss when doing this, the effect in most systems will be imperceptible.
CDM-570A: The IF port connectors are both BNC female types. The return loss on these ports is
17 dB minimum for BOTH 50Ω and 75Ω systems.
3.2.1.1 Rx IF Connectors
Connector Type Description Direction
CDM-570AL: Type ‘N’
(Shown at left)
Rx IF signal, L- Band
In
CDM-570A: BNC
(Shown at right)
Rx IF signal, 70/140 MHz band
3.2.1.2 Tx IF Connectors
Connector Type Description Direction
CDM-570AL: Type ‘N’
(Shown at left)
Tx IF signal, L- Band
Out
CDM-570A: BNC
(Shown at right)
Tx IF signal, 70/140 MHz band