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Page Title: Rf Alignment, Transmit Mode.
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TM 11-5820-509-35
(5) Connect the rf probe of the multimeter to
L56 (fig. 3-96) to obtain maximum voltmeter reading.
RF OUT jack (J13) on the test fixture and adjust
Minimum limit is 0.04 volts rms.
inductor L67 (fig. 3-105) to obtain maximum output.
(14) Rotate the switch of the indexing fixture to
7 and set the output of the signal generator to
NOTE
approximately 7.0 MHz.  Adjust the output level and
Adjust the output level of the signal
frequency of the signal generator until an indication is
generator as required to  limit the
obtained on the voltmeter.
maximum
indication
on
the
(15) Adjust inductors L12, L27, L42, and L57
multimeter to 80 volts rms.
(fig.  3-96) to obtain maximum voltmeter reading.
(6) On the indexing fixture, rotate the slug
Minimum limit is 0.04 volts rms.
rack control to the 999 position. On the test fixture set
(16) Rotate the switch on the indexing fixture
OSC CONTROL switches to 9 and 99; then adjust
to 8 and set the output of the signal generator to
inductor L5 ((fig.. 3-96) for maximum output indication.
approximately 8.0 MHz.  Adjust the output level and
(7) Reset the slug rack control on the
frequency of the signal generator until an indication is
indexing fixture to the 000 position and set the OSC
obtained on the voltmeter.
CONTROL switches to 0 and 00; then repeat steps (5)
(17) Adjust inductors L13, L28, L43, and L58
and (6) until further adjustment no longer increases the
(fig.  3-96) to obtain maximum voltmeter reading.
output level.
Minimum limit is 0.04 volts rms.
(8) Record the signal generator output level
(18) Rotate the switch of the indexing fixture to
necessary to produce 80 volts rms at J13, as the
9 and set the output of the signal generator to
indexing fixture is placed at the 000, 500, and 999
approximately 9.0 MHz.  Adjust the output level and
positions (set OSC CONTROL switches on the test
frequency of the signal generator until an indication is
fixture to identical values as the indexing fixture). The
obtained on the voltmeter.
output level must remain between 30 and 300 millivolts
at each setting across the band.
(19) Adjust inductors L14, L29, L44, and L59
(fig.  3-96) to obtain maximum voltmeter reading.
(9) On the indexing fixture set the switch to 3
Minimum limit is 0.04 volts rms.
and rotate the slug rack control to the 000 position. Set
the OSC CONTROL switches on the test fixture to 0 and
120) Rotate the switch of the indexing fixture to 10 and
00; then adjust inductor L68 (fig. 3-105) for maximum
set the output of the signal generator to approximately
output voltage.
10.0 MHz. Adjust the output level and frequency of the
signal generator until an indication is obtained on the
(10) Repeat step (8).
(11) On the indexing fixture, set the switch to 4
(21) Adjust inductors L15, L30, L45, and L60
and rotate the slug rack control to its 000 position. Set
(fig.  3-105) to obtain maximum voltmeter reading.
the OSC CONTROL switches on the test fixture to 0 and
Minimum limit is 0.04 volts rms.
00; then adjust inductor L69 (fig. 3-105) for maximum
output voltage.
(22) Rotate the switch of the indexing fixture to
11 and set the output of the signal generator to
(12) Repeat step (8).
approximately 11.0 MHz. Adjust the output level and
(13) On the indexing fixture, set the switch to 5
frequency of the signal generator until an indication is
and rotate the slug rack control to its 000 position. Set
obtained on the voltmeter.
the OSC CONTROL switches on the test fixture to 0 and
(23) Adjust inductors L16, L31, L46 and L61
00; then adjust inductor L70 (fig. 3-96) for maximum
(fig.  3-105) to obtain maximum voltmeter reading.
output voltage.
Minimum limit is 0.04 volts rms.
(14) Repeat step (8).
h. Rf Alignment, Transmit Mode.
(15) On the indexing fixture, set the switch to 6
(1) On the test fixture, place the FUNCTION
and rotate the slug rack control to its 000 position. Set
SEL switch to XMIT, the LOOP SEL switch to CLOSED,
the OSC CONTROL switches on the test fixture to 0 and
then place the POWER ON-OFF switch to ON, and
00; then adjust inductor L71 (fig. 3-96) for maximum
OSC CONTROL switches to 0 and 00.
output voltage.
(2) Rotate the switch on the indexing fixture
(16) Repeat step (8).
(fig. 6-7) to 2 and set the slug rack control to the 000
(17) On the indexing fixture, set the switch to 7
position.
and rotate the slug rack control to its 000 position. Set
(3) On the top of the module, rotate the rf
the OSC CONTROL switches on the test fixture to 0 and
gain control (R148) to its clockwise stop.
00; then adjust inductor L72 (fig. 3-96) for maximum
output voltage.
(4) Adjust the signal generator to 500 kHz,
CW operation, and connect the RF OUTPUT jack to 500
(18) Repeat step (8).
KHZ IN jack (J18) on the test fixture.
6-23


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