Comtech EF Data CDM-570 - Manual (Page 67)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Rear Panel Connectors and Pinouts MN/CDM570L.IOM
3–3
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 50
Ω ‘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 75
Ω
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 50
Ω and 75Ω systems.
3.2.1 Rx IF Connectors
Connector Type Description Direction
CDM-570L: Type ‘N’
(Shown at left)
Rx IF signal, L- band
In
CDM-570: BNC
(Shown at right)
Rx IF signal, 70/140 MHz band
3.2.2 Tx IF Connectors
Connector Type Description Direction
CDM-570L: Type ‘N’
(Shown at left)
Tx IF signal, L- band
Out
CDM-570: BNC
(Shown at right)
Tx IF signal, 70/140 MHz band