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|  TRC-68, or terminal board TB1702-23,
500, 3,000, and 6,000 cps and repeat the
AN/VRC-24) and chassis ground. Repeat
distortion measurement for each fre-
the procedure in d above. The fixed level
quency. The harmonic distortion must not
audio signal, as indicated on the ME-30B/
exceed 10 percent.
U, must be within 1.5 of 17 db.
e. Repeat the procedures in c and d
above for rt unit frequencies of 310.0 mc
and 255.0 mc.
f. Increase the audio signal input to 0.4
volts rms and repeat the procedures in c,
a. Perform the final test procedures
d, and e above. The distortion for this in-
listed in a, b, and c below after repair and
put level must not exceed 20 percent.
reassembly of the frequency selector.
Note the pattern of any troubles which may
occur during these tests. Analysis of these
patterns will aid in locating the cause of the
a. Make the following connections. Use
troubles.
figure 118 as a guide.
(1) Connect the TS-382/U and the
a. Manual Frequency Selection.
(1) Turn the CHAN SEL control to
dummy microphone to the AF IN-
MANUAL and turn the MANUAL
PUT and AF INPUT RETURN ter-
FREQUENCY TENTHS control to
minals on the audio test box.
position .0 through .9 and, at each
(2) Connect the audio test box 10-pin
position, check for a corresponding
connector to the AUDIO receptacle
indication on dial assembly I1203.
on the rt unit front panel.
(2) Turn the MANUAL FREQUENCY
(3) Connect the AN/URM-43A to the
UNITS control to positions 0
ANT. terminal on the rt unit.
through 9 and, at each position,
b. Adjust the TS-382/U to apply an input
check for a corresponding indica-
signal (0.1 volt rms at 1,000 cps) across
tion on dial assembly 11202.
the 150-ohm resistor in the dummy micro-
(3) Turn the MANUAL FREQUENCY
phone.
TENS control to positions 22
c. Connect the 600-ohm load and the ME-
through 39 and, at each position,
30B/U between the audio test SPEAKER
check for a corresponding indica-
and AF OUTPUT RETURN terminals.
tion on dial assembly I1201.
d. Key the rt unit by connecting the
b. Remote Channel Selection.
RADIO CONT LINE and CONT LINE RE-
(1) Preset the channels on the memory
TURN terminals on the audio test box.
drum (TM 11-5820-222-10) as in-
The speaker sidetone levels as indicated on
dicated in the following chart.
the DB scale of the ME-30B/U, must not
exceed +10 db.
e. Connect the 600-ohm load and the
ME-30B/U across the audio test box AF
OUTPUT RETURN and HEADSET termi-
nals. Repeat the procedure in d above. The
headset sidetone level, as indicated on the
ME-30B/U, must be within 1.5 of 24 db.
f. Remove the 10-pin connector from the
AUDIO receptacle on the rt unit and con-
nect it to either AUDIO jack on the C-1439/
U. Repeat the procedure in d above. The
remote sidetone audio, as indicated on the
ME-30B/U, must be within 1.5 of 27 db.
g. Connect the 600-ohm load and the
ME-30B/U between the fixed level audio
terminal (AUXILIARY jack J1403-R, AN/
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