5- to 14- MHz Ringer Circuit Alignment.

TM 11-5820-509-35

(13) Rotate the switch-on the indexing fixture

continue

the

procedures

after

to 7 and set the receiver to 10.0 MHz.

performing the remaining initial

setup instructions.

(14) Adjust capacitor C258 to provide a 10.000

MHz reading on the receiver (or frequency counter).

d. 5- to 14- MHz Ringer Circuit Alignment.

Readjust capacitor C258 for minimum 1-MHz ripple on

(1) Connect the oscilloscope and receiver (or

the oscilloscope wavetrain. The remaining 10.0 MHz

frequency counter) and the multimeter rf probe to the 5-

wavetrain amplitude shall not be less than 0.9 volt peak-

14 MHz tip jack at the right side of the upper shelf of the

to-peak.

test fixture.

(15) Rotate the switch on the indexing fixture

(2) Set the switch on the indexing fixture (fig.

to 8 and set the receiver to 11.0 M Hz.

6-7) to 2, and the slug rack control to 000 position.

(16) Adjust capacitor C260 to provide an

(3) On the test fixture, place the POWER

11.000 MHz reading on the receiver (or frequency

ON-OFF switch to ON, the FUNCTION SEL switch to

counter}. Readjust capacitor C260 for minimum 1-MHz

RCVR, the AVC switch to ON, the LOOP SEL switch to

ripple on the oscilloscope wavetrain. The remaining

CLOSED, and OSC CONT switches to 0 and 00.

11.0 MHz wavetrain amplitude shall not be less than 0.9

(4) Adjust capacitor C248 (fig.

3-97) to

volt peak-to-peak.

provide a 5.000 MHz reading on the receiver (or

(17) Rotate the switch on the indexing fissure

frequency counter) Set the oscilloscope sweep rate to

to 9 and set the receiver to 12.0 MHz.

1.0 microseconds/cm. and readjust capacitor C248 for

(18) Adjust capacitor C262 to provide a 12.000

minimum 1-MHz ripple (amplitude modulation) on the

MHz reading on the receiver (or frequency counter).

oscilloscope wavetrain.

The remaining 5.0 MHz

Readjust capacitor C262 for minimum 1-MHz ripple on

wavetrain amplitude shall be not less than 0.9 volts

the oscilloscope wavetrain. The remaining 12.0 MHz

peak-to-peak.

wavetrain amplitude shall not be less than 0.9 volt peak-

(5) Rotate the switch on the indexing fixture

to-peak.

to 3 and set the receiver to 6.0 MHz.

(19) Rotate the switch on the indexing fixture

(6) Adjust capacitor C250 to provide a 6.000

to 10 and set the receiver to 13.0 MHz.

M Hz reading on the receiver (or frequency counter).

(20) Adjust capacitor C264 to provide a 13.000

Readjust capacitor C250 for minimum 1-MHz ripple on

MHz reading on the receiver (or frequency counter).

the oscilloscope wavetrain. The remaining 6.0 MHz

Readjust capacitor C264 for minimum 1-MHz ripple on

wavetrain amplitude shall not be less than 0.9 volts

the oscilloscope wavetrain. The remaining 13.0 MHz

peak-to-peak.

wavetrain amplitude shall not be less than 0.9 volt peak-

(7) Rotate the switch on the indexing fixture

to-peak.

to 4 and set the receiver to 7.0 MHz.

(21) Rotate the switch on the indexing fixture

(8) Adjust capacitor C252 to provide a 7.000

to 11 and set the receiver to 14.0 M Hz.

MHz reading on the receiver (or frequency counter).

(22) Adjust capacitor C266 to provide a 14.000

Readjust capacitor C252 for minimum 1-MHz ripple on

MHz reading on the receiver (or frequency counter}.

the oscilloscope wavetrain. The remaining 7.0 MHz

Readjust capacitor C266 for minimum 1-MHz ripple-on

wavetrain amplitude shall not be less than 0.9 volt peak-

the oscilloscope wavetrain. The remaining 14.0 MHz

to-peak.

wavetrain amplitude shall not be less than 0.9 volt peak-

(9) Rotate the switch on the indexing fixture

to-peak.

to 5 and set the receiver to 8.0 MHz.

e. Oscillator Output Test

(10) Adjust capacitor C254 to provide an 8.000

(1) Rotate the indexing fixture switch (fig. 67)

MHz reading on the receiver (or frequency counter).

to 2, and set the slug rack control to 500.

Readjust capacitor C254 for minimum 1-MHz ripple on

the oscilloscope wavetrain. The remaining 8.0 MHz

(2) On the test fixture, set the LOOP SEL

wavetrain amplitude shall not be less than 0.9 volt peak-

switch to CLOSED, place OSC CONTROL switch S1 to

to-peak.

0, and set OSC CONTROL switch S2 to 50.

(11) Rotate the switch on the indexing fixture

(3) Connect the multimeter rf probe to the

to 6 and set the receiver to 9.0 MHz.

test fixture VFO jack.

(12) Adjust capacitor C256 to provide a 9.000

(4) Read the multimeter; then rotate the

MHz reading on the receiver (or frequency counter).

switch on the indexing fixture to 3, and the OSC

Readjust capacitor C256 for minimum 1-MHz ripple on

CONTROL switch S1 to 1 and read the multimeter

the oscilloscope wavetrain. The remaining 9.0 MHz

again. Continue the simultaneous advancement of the

wavetrain amplitude shall not be less than 0.9 volt peak-

indexing fixture switch and the OSC CONTROL switch

to-peak.

S1 throughout their range. The multimeter reading shall

not be leas than 1.0 volt at any band position.

6-20