TM 11-6625-1633-45
INTERNAL
(3) DEVIATION METER RANGE selector
MODULATION
switch to 300 KC.
FREQUENCY
Trimmer capacitor
Frequency meter
(4) INTERNAL MODULATION FREQUENCY
switch position
adjustment
indication (Hz)
to 1000 ~.
1000~
C1
990 to 1010
1600~
C5
1584 to 1616
(5) POWER OFF toggle switch to up.
20KC
C9
19,800 to 20,200
68KC
C13
67,320 to 68,680
b. Adjust deviation meter adjustment potentiometer
108KC
C17
106,920 to 109,080
AlR1 (fig. 3-9) to position the pointer of deviation meter
e. Disconnect the test equipment and reconnect con-
M1 against the right hand stop post.
nector P13 to jack A1J4.
4-19. Deviation Accuracy Adjustments
4-17. Modulation Oscillator Output
Adjustment
a. Connect the input of the TS-723D/U to the signal
generator RF OUTPUT connector J5.
and connect the AN/USM-140 input to connector P3.
and set the controls as indicated below:
and set the controls to the positions listed below:
NOTE
Allow the unit to warm up for 30 minutes.
NOTE
Allow the signal generator to warm up for
(1) DEVIATION METER RANGE selector
15 minutes.
switch to 300 KC.
(2) INTERNAL MODULATION FREQUENCY
(1) MODULATION selector switch to INT SINE.
to 108 KC.
(2) DEVIATION control knob fully clockwise.
(3) POWER OFF toggle switch to up.
(3) POWER OFF toggle switch to up.
c. Set the INTERNAL MODULATION FRE-
indication of 600 MHz.
QUENCY selector switch to positions indicated in the
following chart and make the adjustments shown to ob-
d. Set MODULATION selector switch to OFF and
tain the approximate peak-to-peak voltages indicated on
adjust ZERO SET control knob for a zero set indication
the oscilloscope.
on the power set meter.
INTERNAL
e. Set MODULATION selector switch to CW.
MODULATION
FREQUENCY
Adjustment
Oscilloscope peak-to-peak
f. Adjust POWER SET control knob for a power set
switch position
potentiometer
voltage indications (volts)
1000~
R16
5.6
meter indication as the red reference line.
1600~
R18
5.6
20KC
R19
5.6
CAUTION
68KC
R20
5.6
108KC
R21
5.6
Do not perform adjustments if indication
is within specified limits.
d. Disconnect the test equipment and reconnect con-
nector P3 to jack AlJ3.
g. Tune the TS-723D/U to place signal display at the
center of the screen.
4-18. Deviation Meter Adjustment
h. Adjust RF OUTPUT control for a convenient
spectrum analyzer display height.
and set the controls to the positions listed below:
i.. Set MODULATION selector switch to INT SINE.
NOTE
Allow the signal generator to warm up for
j. Adjust the DEVIATION control knob until a car-
30 minutes.
rier null is displayed on the TS-723D/U.
(1) MODULATION selector switch to INT SINE.
k. Observe that the deviation meter indicates between
(2) DEVIATION control knob fully clockwise.
208 and 312 KHz.
4-7
