4-Wire Audio Connector; Post Installation Checks - GE MDS 4790M Installation And Operation Manual

400 mhz master station radio for mpt 1411 applications

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Figure 15. Alarm Relay Connections

4-Wire Audio Connector

J2 is a plug-in terminal strip that provides connections for 4-wire audio circuits.

Figure 16 shows the function of each terminal as viewed from the rear panel.

Terminals 1 and 2 are for transmit audio input with a nominal 600

impedance. Terminals 3 and 4 provide a receive audio output with a nominal

600

impedance. Pins 5 and 6 provide a source for an external keying source.

Connecting pins 5 and 6 together keys the radio.

Figure 16. 4-Wire Audio Connections

Before applying power to the radio, verify that:

• All connections are properly wired and secure

• Input voltage matches that of the installed power supply

• Antenna heading is preset in the direction of the associated station.

This completes the installation of the radio. Section 5.0, START-UP AND

OPERATION, describes the unit's indicators and gives initial startup procedures.

MDS 4790M (MPT 1411) I/O Guide

Invisible place holder

MDS 05-3628A01, Rev. B

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