RXMT Capability Modes

TM 11-5820-890-10-8

4.9b.

RXMT Capability Modes

FH NET TO FH NET

With extensive fielding of the SINCGARS radio, FH net to FH net RXMT

links will probably be the normal mode of operation. RADIO-A and

RADIO-C use the same FH data, including net ID. Communications

between these two radios is no different than that between any two

radios of the same net. RADIO-B, which is normally a member of this

net, is out of range or has lost line of sight. In the FH to FH RXMT

operation, RADIO-B and RADIO-D use a different net ID than that

used by RADIO-A and RADIO-C. Use of the same hopset and TSK

poses no problem. When the requesting station (RADIO-A) calls the

outstation (RADIO-B) using one net ID, the message passes through

RADIO-C and the RXMT cable to RADIO-D, which then sends the

message to RADIO-B using another net ID. Other than a slight delay in

transmission and the fact that distance and obstacles are overcome,

there is no difference between direct and RXMT communications.

FH NET TO SC NET

It is anticipated that there will be both US and Allied Forces units

equipped with SC only radios for some time. When it is necessary for a

FH net to make contact or maintain communications with a unit using

an SC net, RXMT can be useful regardless of distance or obstacles. In

the FH to SC RXMT operation, RADIO-A and RADIO-C are frequency

hopping, while RADIO-B and RADIO-D operate in the single channel

mode. RADIO-A and RADIO-C use the same FH data; RADIO-B

and RADIO-D use the same SC frequency. An FH message entering

RADIO-D reaches RADIO-B as SC traffic. A SC message entering

RADIO-C reaches RADIO-A as FH traffic.

SC NET TO SC NET

Although there should be little need for this mode of RXMT operation, it

is available if required. In this case, RADIO-A and RADIO-C operate

on a SC frequency that is at least 10 MHz different from that used by

RADIO-B and RADIO-D.

DATA SOURCES

Net ID and SC frequencies used in RXMT operations are obtained from

your SOI or unit SOP.

At the RXMT site, maximum results are attained by using two OE-254

ANTENNAS

antennas, separated as far as cabling will permit. The least satisfactory

results will be obtained if two installed antennas on the same vehicle

are used.

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