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 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
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
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