TM 11-5840-360-14-1-1
2.3.6 Initial Alignment
2.4.2 T-Bar Vibration Damper Adjustment
Perform the initial inspections, checks and
NOTE
alignments (if necessary) per paragraphs 5.7.1.2
This adjustment is made at the
through 5.7. 1.4.
factory. Readjustment at installation
is not necessary unless the original
2.4 ANTENNA AS-3194 MOUNTING INSTRUCTIONS
adjustment has been disturbed.
2.4.1 Array Mounting
The antenna array is secured to the T-bar using four
The antenna array and the pedestal are shipped in
shouldered mounting studs and associated hardware
separate packages and must be assembled at or near
which also provide vibration damping. During system
the installation site. It is recommended that a 9- or 12-
installation, correct adjustment of the vibration damping
foot antenna array be assembled to the pedestal on
hardware can be checked as follows:
deck, then hoisted into position and mounted as a unit.
The 6-foot array can be assembled on a premounted
1. Verify that the distance between the
pedestal with relative ease. Refer to Figure 6.3-2 when
bottom of the shoulder on the shouldered stud and the
performing the following procedure:
top of the flat washer is 0.950 0.010 inch.
2. Turn the lower locknut if adjustment is
CAUTION
necessary.
DO NOT SCRATCH OR OTHERWISE
DAMAGE THE PROTECTIVE COVER
2.5 RECEIVER TRANSMITTER RT-1240
ON THE FRONT OF THE ANTENNA
ARRAY.
2.5.1 Mounting Hardware
NOTE
The parenthetical entries in the
When installing the receiver transmitter, the
following steps refer to Find Number
following general rules must be observed as applicable:
on Figure 6.3-2, which should be
1. Corrosion-resistant (i.e. stainless steel)
used to identify and locate parts
mounting hardware should be used.
called out in the procedure.
2. Mating surfaces of dissimilar metals
should be coated with a silicone compound such as Dow
1. Apply a coat of waterproofing compound
Corning DC4 (Part Number 230-1014P3) to prevent
between mating surfaces of the hub (4) and T-bar.
corrosive metal action.
2. Locate sealing gasket and O-ring gasket
supplied with the antenna installation kit.
2.5.2 Mounting Instructions
3. Install the O-ring into the mating groove
of the hub (4).
The receiver transmitter chassis assembly is fitted
with two horizontal channel members to facilitate
4. Install the sealing gasket over the
bulkhead mounting.
Installation dimensions and
waveguide opening in the top of the rotary joint.
clearances for the receiver transmitter are given in
5. Position the antenna array and T-bar
assembly over the hub (4) such that the front of the
to allow for waveguide or cable entry (see Figures 2-1
array is facing the same direction as the "FRONT"
through 2-4), and beneath the unit for cable entry. Allow
marking (keyway side) of the hub (4).
36 inches in front of the receiver transmitter for
6. Align the two guide pins on the T-bar with
servicing and ventilation.
the mating holes in the rotary joint (16).
7. Verify that the alignment pins match up
2.5.3 Interconnections
with the mating holes, then secure the T-bar to the hub
(4) using four 3/8" bolts, flat washers, and lock nuts.
Interconnections to the receiver transmitter are
8. Torque the bolts and lock nuts to 271
shown in Figures 2-1 (V1), 2-2 (V2), 2-3 (V3) and 2-4
inchpounds.
(V4). Additional information is provided in paragraphs
2-17
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