Rf Alignment, Transmit Mode.

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

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).

voltmeter.

(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