GENERAL SUPPORT MAINTENANCE
Section I. REPAIR AND ALINEMENT
5-2. Frequency Range Alinement Procedures
of Antenna. AT-1082/PRC
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-
forming the general support testing procedures
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
replaced or the assembly components can be re-
replacement procedures for the switch assemblies.
(1) Perform the operations given in step
To replace defective components on either switch
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.
ance procedure given in the chart below
associated with the replaced component.
obtain a reading of 30 MHz on frequency
44 for an output frequency of 39 MHz.
(5) Set FINE TUNE control C1 on the AT-
(60 MHz) -
1082/PRC to 9.
(50 MHz) -
(6) Adjust capacitor C3 to obtain a reading
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.
has been replaced,
(8) Repeat the procedures in (4), (5), and
perform the testing procedures given in
(6) above; readjust C3 if necessary.
(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