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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.
4-29


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