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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
4-28


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