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

CDM-570/570L Satellite Modem with Optional IP Module
Rear Panel Connectors and Pinouts
3.2

IF Connections

There may be DC voltages present on the Type 'N' Rx and Tx IF
connectors, up to a maximum of 48 volts.
CDM-570L: The IF port connectors are both 50Ω 'N' female types. The return loss on these
ports is greater than 19 dB (typically better than 21 dB). If there is a need to connect to a 75Ω
system, an inexpensive 'N' to 'F' type adapter can be used. While there will be a reduction in
return loss when doing this, the effect in most systems will be imperceptible.
CDM-570: The IF port connectors are both BNC female types. The return loss on these ports is
greater than 17 dB (typically better than 19 dB) in BOTH 50Ω and 75Ω systems.

3.2.1 Rx IF Connectors

3.2.2 Tx IF Connectors

Connector Type
CDM-570L: Type 'N'
(Shown at left)
CDM-570: BNC
(Shown at right)
Connector Type
CDM-570L: Type 'N'
(Shown at left)
CDM-570: BNC
(Shown at right)
3–3
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
Revision 12
MN/CDM570L.IOM
Direction
In
Direction
Out