RETRANSMISSION (RXMT) OPERATIONS

TM 11-5820-890-10-8

RETRANSMISSION (RXMT) OPERATIONS

4.9.

4.9a.

General

The SINCGARS radio has a built-in retransmission capability which

BUILT- IN CAPABILITY

requires only two radios and the addition of an RXMT cable

(CX-13298) for operations. Any configuration of the ground ICOM

radio can be used for retransmission. The two radios may be installed

on the same vehicle, on two separate vehicles, or two manpack

versions may be used. RXMT cables come in two lengths, 5 inches and

15 feet, to accommodate various radio configurations.

There are three modes of retransmission when using SINCGARS

CAPABILITY MODES

radios: (Each is described below.)

(1)

Frequency hopping net to frequency hopping net.

(2)

Frequency hopping net to single channel net.

(3)

Single channel net to single channel net.

A typical situation requiring retransmission communications is used to

RXMT SITUATION

illustrate the various modes and procedures. An NCS has lost, or is

about to lose, contact with one of the net stations. This could be

caused by distance or line of sight obstacles such as mountains

between the two stations. Whatever the cause, the answer is to

establish an RXMT station at a site that will enable the NCS (requesting

station) and outstation to continue, or resume, communications. In

Figure 4-19, below, note that the requesting NCS uses RADIO-A, the

outstation uses RADIO-B, and the RXMT team uses RADIO-C and

RADIO-D. In RXMT configuration, RADIO-A communicates with

RADIO-B by passing traffic through RADIO-C, the RXMT cable, and

Figure 4-19. RETRANSMISSION SITUATION

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