TM 11-5840-360-14-1-1
removed in step 2.
14. While slowly passing magnet back and forth
across reed switch, carefully adjust the position of the
5.11.3 Alignment Procedures
switch until multimeter indicates a short as magnet
The procedures given in paragraphs 5.11.3.1
passes across switch.
throng h 5.11.3.4 following cover the normally required
shipboard alignments applicable to Antenna Pedestals
15. Replace data unit assembly per paragraph
AB-1247 and AB-1247A. Refer to Figure 5-4 for
location of assemblies and major components.
drive gear are aligned.
5.11.3.1 Bearing and Heading Line Adjustment. -The
16. Replace rotary joint assembly per paragraph
Sweep Circuits Alignment procedure given in paragraph
17. Align per paragraph 5.11.3.1.
necessary) prior to performance of this procedure.
NOTES:
5.11.2.7 Synchro Transmitter B3 (V4). - This procedure
1. For V2 systems, determine which
is applicable to only the AB-1247A antenna pedestal
Receiver Transmitter is controlling
used in AN/SPS-64(V)4 installations. See Figure 5-4;
the Antenna Pedestal by observing
refer to assembly drawings in Chapter 6, Section 6.3 as
the indicator lamps at Interface Unit
necessary.
J-3463.
Also determine which
1. Insure power is removed from pedestal per
Indicator is serving as master for the
controlling Receiver Transmitter by
2. Gain access per steps 2, 3 and 4 of paragraph
observing the setting of Switch ing
Unit SA-2156 and referring to Table
3. Remove rotary joint assembly per paragraph
2. For V3 or V4 systems, refer to
4. Disconnect five harness wires from synchro
transmitter B3, tagging each for connection terminal.
observe settings of Switching Units
5. Loosen the three clamps screws which secure
SA-2139 to determine which Indicator
synchro body; turn the clamps and withdraw the
is serving as master for the antenna
synchro.
pedestal
under
test
and
its
6. Replace synchro transmitter B3 by reversing the
associated receiver transmitter.
preceding steps.
3. The term Indicator, as used in the
7. Align synchro transmitter B3 per paragraph
following steps, refers to the master
Indicator
associated
with
the
antenna pedestal under test and its
5.11.2.8 Antenna Array AS-3194. - Refer to assembly
associated receiver transmitter .
drawings in Chapter 6, Section 6.3 as necessary .
1. Set Indicator HD UP/GYRO STAB/HDG SET
1. Insure power is removed from pedestal per
switch to HO UP position. Identify a target both visually
and on the indicator CRT display.
2: Remove the four bolts, washers, lock washers and
2. Using the ship's port and starboard pelorus.
nuts which secure the array to the pedestal.
measure the visual bearing to the target. Convert the
3. Carefully lift the array from the pedestal,
pelorus readings to relative bearing and compute the
insuring that O-ring and sponge rubber gasket are
mean of the two readings. Use the computed mean
retained.
bearing in the following steps.
4. Before replacing or installing new array, apply
3. Using the Indicator CURSOR control, position
anti-seize compound to top of rotary joint assembly.
the cursor graticule line directly over the target.
CAUTION
4. Observe the Indicator relative bearing scale and
note the reading intersected by the cursor graticule line.
DO NOT SET COMPOUND IN THE
This reading should correspond so that indicated by the
ROTARY JOINT.
ship's pelorus (1.
)
5. Install sponge rubber gasket in base of antenna
NOTE:
support and O-ring in array mounting plate on pedestal.
If the bearing error observed in step
Make sure that the O-ring is lubricated with silicon
4 is 12 or less, perform steps S
grease.
through 14 only.
If the error is
6. Lift array into position above pedestal with array
greater than 12 perform steps 13
,
facing in the direction marked "FRONT" on mounting
through 26 first, then steps 1 through
plate. Align guide pins on bottom of array support with
14.
holes in top of rotary joint and carefully lower array onto
pedestal.
7. Secure array to pedestal using hardware
5-32
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