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Page Title:
CHAPTER 5. GENERAL SUPPORT MAINTENANCE |
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  TM
11-5985-284-15
GENERAL SUPPORT MAINTENANCE
Section I. REPAIR AND ALINEMENT
5-1. Repair
a. General. The frequency range alinement
a. Maintenance of Antenna. AT-1082/PRC at
procedures given in b below are performed when
general support level consists of replacing com-
components of BANDSWITCH assembly
ponents on assemblies A2 and A3, performing the
frequency range alinement (para 5-2), and per-
performance standard given in the frequency
forming the general support testing procedures
range tests (para 5-7) is not within limits. The
30- and 39-MHz test frequencies are used as the
b. BANDSWITCH assembly A2 and ATTEN-
test frequencies; other frequencies used in the op-
UATOR switch assembly A3 each containing its
eration of the AT-1082/PRC should pass through
switch and components (figs. 4-4 and 4-5), can be
satisfactorily.
replaced or the assembly components can be re-
b. Procedure.
placed. Refer to paragraph 4-10 for removal and
replacement procedures for the switch assemblies.
(1) Perform the operations given in step
To replace defective components on either switch
No. 1, paragraph 5-7.
asembly, unsolder the defective components and
(2) When the procedures given in step No. 1,
install their replacements.
.
1082/PRC controls as follows:
(1) After an inductor or capacitor on BAND-
(a) ATTENUATOR: 0.
SWITCH assembly A2 has been replaced,
(b) FINE TUNE :0.
perform the alinement procedures given
(c) BANDSWITCH :30.
in paragraph 5-2 and then the perform-
(3) Adjust the slug in coil L1 (fig. 4-5) to
ance procedure given in the chart below
associated with the replaced component.
obtain a reading of 30 MHz on frequency
Meter AN/URM-80.
A2
Component
Performance
procedure
(4) Readjust Signal Generator AN/USM-
44 for an output frequency of 39 MHz.
L1,
C1
(70 MHz)_
step
No.
5.
(5) Set FINE TUNE control C1 on the AT-
C2
(60 MHz) -
step
No.
4.
L2,
1082/PRC to 9.
L3,
C3
(50 MHz) -
step
No.
3.
(6) Adjust capacitor C3 to obtain a reading
L4,
C4
(40 MHz)-
step
No.
2.
of 39 MHz on the AN/URM-80.
(7) Repeat the procedures in (3) above: re-
( 2 ) After a resistor on ATTENUATOR
adjust L1 if necessary.
switch assembly
has been replaced,
(8) Repeat the procedures in (4), (5), and
perform the testing procedures given in
(6) above; readjust C3 if necessary.
step 2, of paragraph 5-8c through h.
(9) Turn off the power, and disconnect the
c. When capacitor C1 (FINE TUNE control),
C2, or C3 (figs. 4-4 and 4-5) is replaced, perform
equipment. (See para 5-1a(1); other
the alinement procedures given in paragraph 5-2.
Change 1
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