CDM-570A/570AL Satellite Modem with Optional Packet Processor
Revision 5
Rear Panel Connectors and Pinouts 3–6 MN-CDM570A
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
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
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
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