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Connector, Group, 1 if connector group – Comtech EF Data CDM-760 User Manual

Page 53: 1 rx connectors, 2 tx connectors, 3 j10 | tx mon connector, type ‘sma

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Rear Panel Connections

Revision 2

CDM-760 Advanced High-Speed Trunking Modem

MN-CDM760

3–5

3.2.1 IF Connector Group

CAUTION – THERE MAY BE DC VOLTAGES PRESENT ON THE TYPE ‘N’ RX AND TX IF

CONNECTORS, UP TO A MAXIMUM OF 48 VOLTS.

3.2.1.1 Rx Connectors

The J9 | L-BAND RX IN Type ‘N’ connector features an LED labeled “LNB PWR

ON”. When a Low-Noise Block Down Converter (LNB) is installed in an L-Band

configuration, the LED lights amber to indicate the presence of DC voltage.

Ref Des Name

Connector Type

Description

Direction (I/O)

J9

L-BAND RX IN

Type ‘N’ female

Rx IF signal, L-Band

I

J11

IF RX IN

BNC

Rx IF signal, 70/140 MHz band

Note: 75Ω default, 50Ω optional

3.2.1.2 Tx Connectors

The J12 | L-BAND TX OUT Type ‘N’ connector features an LED labeled “BUC

PWR ON”. When a Block Up Converter (BUC) is installed in an L-Band

configuration, the LED lights amber to indicate the presence of DC voltage.

Ref Des Name

Connector Type

Description

Direction (I/O)

J12

L-BAND TX OUT Type ‘N’ female

Tx IF signal, L- band

O

J13

IF TX OUT

BNC

Tx IF signal, 70/140 MHz band

Note: 75Ω default, 50Ω optional

3.2.1.3 J10 | TX MON Connector, Type ‘SMA’

The Type ‘SMA’ female J10 | TX MON connector provides a user monitor

output for the L-Band signal.

Ref Des Name

Connector Type

Description

Direction (I/O)

J10

TX MON

Type ‘SMA’ female

Monitor L-Band Tx IF Output

O