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TM 11-5820-509-35
(2) Remove the dust cover from the module,
(6) Set the audio oscillator output frequency
to 1700 Hz and adjust the level at AUDIO IN jack (J8) to
and plug it into the test fixture.
1.25 volts rms. If the voltmeter reads 0.5 0.1 volt rms
(3) Apply  primary  power  to  all  test
at XMIT OUT jack (J8) continue to step (9) If not,
instruments and turn on each of the units. Immediately
perform steps (7) and (8)
adjust the output of the 24 volts power supply to 20.0
(7) Connect the resistance decade box at the
1.0 volts, the output of the 7 volts power supply to 6.0
eyelets normally used to attach R14 (fig. 3-20), after
0.5 volts, and the output of the 110 volts power supply
removing R14. Set the selector knobs on the decade
to -110 3.5 volts dc.
box to 3900 OHMS.
(4) Place the POWER switch on the test
(8) Repeat step (6) and adjust the resistance
fixture to ON, the AGC and ALC BIAS switches to OFF,
settings of the-resistance decade box until the voltmeter
the XMIT-RCVR switch to RCVR and the METER
reading specifies) is obtained.
Select a suitable
RANGE switch to 200. Permit the test equipment and
resistance and install it in the module at the eyelets from
the module to stabilize for at least 5 minutes before
which the original R14 was removed.
beginning the following procedures.
NOTE
NOTE:
Repeat step (6) after installation of the
Perform the initial adjustments and
replacement R14 to verify that proper
each of the following tests in the
output is indeed available at XMIT OUT
order listed to avoid erroneous test
jack (J4).
results  or  maladjustment  of  the
(9) Adjust capacitor C35 and potentiometer
module alignment.
R5 on the module to minimize the carrier indication on
e. Initial Settings and Adjustments.
the spectrum analyzer.
(1) Set the signal generator to 498.3 kHz (cw
NOTE
operation) and adjust the output level to 100 microvolts
If capacitor C35 is adjusted to either
at RCVR IN jack (J6) Connect the voltmeter to AUDIO
limit, select a new value for shunting
OUT jack (J7} and adjust Cl5, C17, L6, L7, and T3 for
capacitor  C36  that  permits  an
maximum output. Record this output reading in dB for
intermediate setting. Repeat step (9), if
reference below.
necessary.
(2) Slowly vary the signal generator output
d. Output, Receive.
frequency between 497.0 and 499.7 kHz and observe
(1) Place the XMIT-RCVR switch on the test
the point at which minimum output occurs.
The
fixture to RCVR (the AGC and ALC BIAS switches
minimum audio output level at J7 shall not be more than
remain OFF).
3 dB below the reading recorded in step (1) above.
(2) Disconnect the audio oscillator and the
NOTE
spectrum analyzer converter from the test fixture and
If the minimum audio output level is
connect the voltmeter to AUDIO OUT jack (J7)
greater  than  3  dB  below  the
(3) Connect  the  signal  generator  and
maximum output level observed in
frequency counter to RCVR IN jack (J6) and set the
step (1), set the signal generator to
signal generator output frequency to 498.3 kHz.
this frequency.  Then readjust C15
(4) Adjust the output level of the signal
and C17 to increase the output until
generator until the voltmeter reads 0.1 volt rms; then
it meets the performance standard.
move the voltmeter to RCVR IN jack (J6) and measure
Repeat steps (1 ) and (2) to verify.
the output level of the signal generator. The level at J6
(3) Place the XMIT-RCVR switch on the test
shall not be greater than 200 microvolts.
fixture to XMIT (the AGC and the ALC BIAS switches
e. Distortion, Receive.
remain OFF); connect the voltmeter and spectrum
(1) The AGC and ALC BIAS switches remain
analyzer converter to the XM IT OUT jack.
OFF and the XMIT-RCVR switch remains in the RCVR
(4) Connect the audio oscillator to AUDIO IN
position.
jack (J8) Set the output frequency to 2800 Hz and adjust
(2) Verify that the signal generator output
the output level to 1.25 volts rms.
frequency is 498.3 kHz and that the output is connected
(5) Adjust transformer T2 (fig.
to RCVR IN jack (J6).
inductor L4 to obtain a maximum indication on the
voltmeter at XMIT OUT jack (J4).
6-17


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