TM 11-5985-355-13
CHAPTER 2
INSTALLATION AND OPERATION
WARNING
Dangerous rf voltages exist at AS-2731/GRC elements and connectors. KEEP
YOU NEVER KNOW WHEN SOMEONE IS TRANSMITTING ON THE RADIO.
Section I. SERVICE UPON RECEIPT OF EQUIPMENT
brackets and surfaces as AS-1729/VRC. Refer to SB
2-1. Checking Unpacked Equipment
11-131 for the list of authorized vehicular radio sets and
a. Inspect the equipment for damage that may
installation kits.
have occurred during shipment. If the equipment has
been damaged, fill out and forward SF 364.
CAUTION
b. Check to see that the equipment is complete as
When mounting the MX-9146/GRC in a
listed on the packing slip. If a packing slip is not
mounting bracket, or in a vehicle hole,
available, check the equipment against the components
do not tighten the mounting bolts above
list (app B). Report all discrepancies in accordance with
100 inch-pounds (snug tight). Excessive
instructions given in paragraph 1-3c (DISREP).
force may crack the base insulator or
c. Check to see whether the equipment has been
damage the helicoil threads in the hulls
modified. If the equipment has been modified, the MWO
of some vehicles.
b. Attach the MX-9146/GRC on the vehicle (fig. 2-
number will appear on the MX-9146/GRC, near the
3 and 2-4) as described in the installation kit (a above)
nomenclature plate. Check DA Pam 310-4 to see
with the supplied mounting hardware.
whether all MWO's current at the time the equipment is
c. Remove the dust cover from threaded end of
placed in use have been applied.
cable mount assembly. Insure that the contact on top of
2-2. Siting
MX-9146/GRC protrudes fully and two setscrews and a
(fig. 2-1)
cap screw (fig. 2-2) holding rf assembly contact in place
The best location for the AS-2731/GRC depends on the
are firmly secured.
type of vehicle and the terrain. The AS-2731/GRC will
NOTE
have a greater effective range if it is high and clear of
The dust cover protects the contact on
hills, buildings, cliffs, and wooded areas. Valleys and
top of the cable mount from dirt, dust
other low places are poor locations for radio reception
and other damage. The dust cap should
and transmission because the surrounding high terrain
be installed whenever the AS-2732/GRC
absorbs radio frequency (rf) energy. Clear, strong
is not connected to the MX-9146/GRC.
signals cannot be expected if the AS-2731/GRC is
d. Apply a small quantity of silicone comp. (item 3
operated under, or close to, steel bridges, underpasses,
powerlines, power units, or hospitals. If possible, choose
appx E) to the threads of the spring mount assembly and
a location on a hilltop or other high place. A flat
to the O-ring (MS9068-213) at the base of the threads.
surrounding terrain is desirable. Generally, reception
e. Screw and tighten the AS-2732/GRC onto the
and transmission is better over water than over land.
cable mount assembly.
f. Thread a 5-inch length of lockwire (item 6, app
2-3. Installation Instructions
E) through the two small holes in the hexagonal portion
(fig. 2-2, 2-3 and 2-4)
of the AS-2732/GRC and then through a pair of safety
a. Antenna AS-2731/GRC mounting dimensions
holes in the cable mount on the MX-9146/GRC.
are the same as those in Antenna AS-1729['RC; thus,
the AS-2731/GRC can be mounted on the same
Change 2 2-1
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