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Section III. ALIGNMENT
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TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
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Alignment of Second Oscillator


or J703 on the front panel of the
equipment performance. When perform-
rt unit.
ing overall alignment of the equipment,
(4) Connect the 600-ohm, 2-watt re-
perform the procedures in the order in
sistor between the SPEAKER and
which they are listed. When only one
the AF OUTPUT RETURN ter-
alignment procedure is performed, it is
minals of the audio test box.
assumed that all other subunits are prop-
(5) Connect the radio set to the ex-
erly aligned. Before attempting alignment,
ternal power source and monitor
read the complete alignment procedure
the input voltage with the ME-26/U.
carefully to become familiar with the
Be sure that the input voltage is
steps involved. Do not attempt alignment
within the operating range of the
of the equipment as a substitute for trouble-
radio set (Radio Set AN/VRC-24,
shooting. Attempt alignment only after
-22 to -30 volts dc; Radio Set AN/
troubleshooting procedures indicate the
TRC-68, 103 to 127, or 207 to 253
need for alignment.
volts ac).
c. Control Settings.
b. Preliminary Test Setup.
(1) Remove the rt unit from its case
(TM 11-5820-222-20).
Warning:  Voltages dangerous to life
(2) Connect Electrical Special Pur-
(+125 volts, +300 volts dc) are present
pose Cable Assembly CX-4884/U
in Receiver-Transmitters RT-323/VRC-
(extension cable) between P1 of the
24 and RT-441/TRC-68.
rt unit and the mating jack in the
(1) The preliminary control settings
case.
for Receiver-Transmitter RT-
(3) Connect the audio test box (para
323/VRC-24 or RT-441/TRC-68
128) to either AUDIO jack J702
171


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