If Connections Group; Rx If Connectors; Tx If Connectors - Comtech EF Data CDM-570A Installation And Operation Manual

CDM-570A/570AL Satellite Modem with Optional Packet Processor
Rear Panel Connectors and Pinouts

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

3.2.1.2

Tx IF Connectors

Connector Type
CDM-570AL: Type 'N'
(Shown at left)
CDM-570A: BNC
(Shown at right)
Connector Type
CDM-570AL: Type 'N'
(Shown at left)
CDM-570A: BNC
(Shown at right)
3–6
Description
Rx IF signal, L- Band
Rx IF signal, 70/140 MHz band
Description
Tx IF signal, L- Band
Tx IF signal, 70/140 MHz band
MN-CDM570A
Revision 3
Direction
In
Direction
Out