TM 11-6625-1633-45
MODULATION selector switch to OFF and re-
b. Allow a 2 hour warmup period for the equipment.
peat the procedures in l through o above. Then
c. Set the controls of Frequency Meter TS 186D/UP as
reset the wattmeter.
follows:
(1) POWER:
ON (up)
(2) IND switch:
BEAT IND
600-1850 MC
WATTMETER INDICATOR
FREQUENCY MC
MINIMUM (DBM)
MAXIMUM (DBM)
(3) XTAL CAL:
ON
counter
(4) VOLUME:
Max ccw
600
-8
-6
(5) HET OSC:
ON
700
-8
-6
800
-8
-6
900
-8
-6
1000
-8
-6
as follows:
1100
-8
-6
1200
-8
-6
(1) POWER OFF toggle
on (up)
1300
-8
-6
switch:
1400
-8
-6
1500
-8
-6
(2) MODULATION
INT SINE
1600
-8
-6
selector switch:
1700
-8
-6
(3) DEVIATION METER
300 KC
1800
-8
-6
1850
-8
-6
RANGE selector
switch:
(4) INTERNAL
1000 cps
5-11. Rf Output Resistance Test
MODULATION
FREQUENCY
a. Set the controls of the TS-352B/U as follows:
selector switch:
(1) FUNCTION switch to OHMS.
(5) DEVIATION control
Fully clockwise
(2) Range switch to RX1 position.
knob:
b. Set the controls of the AN/URM-149 as follows:
(1) Center frequency selector hand wheel to 700.
e. Calibrate the TS-186D/UP Frequency Meter by turning
(2) POWER OFF toggle switch to on (up).
the IND switch to each of its positions, and comparing the
c. Short-circuit the multimeter test leads.
meter indications listed in the chart below:
d. Adjust the OHMS ZERO ADJ to position the mul-
timeter pointer directly over the zero on the right side of the
IND SWITCH position
METER INDICATION
OHMS scale.
BEAT IND
.8 - .9
DET
.2 - .2
OUTPUT jack.
XTAL
.02 - .05
NOTE
HET OSC
.6 - .95
The multimeter indication should be between
f. At the proper dial setting corresponding to 1000 Hz, set
45 and 55 ohms.
the TUNING DIAL assembly (refer to the calibration man-
ual).
g. Put on the headset and adjust the VOLUME control un-
wheel to 1400.
til the background noise is at a comfortable listening level.
h. Adjust the TUNING DIAL in the vicinity of the setting
OUTPUT jack.
determined in f above.
NOTE
i. Set the AN/URM-149 INTERNAL MODULATION
The multimeter indication should be between
FREQUENCY selector switch to the positions which follow:
45 and 55 ohms.
(1) 1000 CPS
5-12. Internal Modulation Frequencies
(2) 1600 CPS
Accuracy Test
(3) 20 KC
(4) 68 KC
(5) 108 KC
5-6
