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|  PUT and AF INPUT RETURN ter-
and 10,000 cps must be at least
6 db lower than that in (4) above.
minals on the audio test box. Con-
(7) The ME-30B/U indications at 250,
nect the 10-pin connector on the
3,000, and 6,000 cps must be with-
test box to the AUDIO jack on the
in 2 db of that in (4) above.
rt unit.
c. Broadband Audio Test Procedure.
(2) Connect Variable Attenuator CN-
(1) Remove the rt unit from its case
318/U, the AN/URM-43A, the T-
and set switch S801 to BB. Replace
coaxial connector, the linear de-
the rt unit in its case. (Refer to
tector, and the ME-30B/U.
b. Adjust the TS-382/U to produce a test
T M 11-5820-222-20 for proce-
signal of 0.1 volt at 1,000 cps across the
dure and location of S801.)
(2) Make the connections given in a
150-ohm resistor in the dummy micro-
phone.
above, except omit the dummy
c. Tune the rt unit to 399.9 mc and key
microphone and connect the TS-
it by shorting the RADIO CONT LINE ter-
382/U, through the matching pad
minal to the CONT LINE RETURN termi-
nal on the audio test box.
and D of BROAD BAND jack J704.
d. Note the demodulated audio output at
(3) Set the TS-382/U to 1,000 cps.
the linear detector, as indicated in db on
Connect the ME-30B/U across the
the ME-30B/U.
600-ohm resistor in the matching
e. Remove the 1,000-cps signal input
pad (fig. 119, note 3), and adjust
and note the db reading on the ME-30B/U.
the TS-382/U signal level for 0.1
The db reading should be at least 35 db
volt on the ME-30B/U. Record the
below the reading obtained in d above.
TS-382/U output level meter indi-
cation.
(4) Connect the ME-30B/U to the out-
put of the linear detector. Record
a. Make the following connections to the
the level of the demodulated output
rt unit. Use figure 119 as a guide.
signal, in decibels, indicated on the
(1) Connect the TS-382/U through the
ME-30B/U.
dummy microphone to the AF IN-
(5) Set the TS-382/U to 100,250,3,000,
PUT and AF INPUT RETURN ter-
6,000, 10,000, 15,000, and 25,000
minals on the audio test box. Con-
cps and record the ME-30B/U in-
nect the 10-pin connector on the
dication (in db) at the linear de-
audio test box to the AUDIO jack
tector for each frequency.
on the rt unit.
Note. Maintain a constant signal level
(2) Connect Variable Attenuator CN-
from the TS-382/U at the above frequen-
318/U, the AN/URM-43A, the T-
cies by maintaining the TS-382/U output
coaxial connector, and the linear
level meter indication recorded in (3)
detector.
above.
(6) The ME-30B/U indications at 100
(3) Connect the TS-723A/U across the
output of the linear detector.
cps must be not more than 5 db
b. Adjust the TS-382/U to produce a test
below that in (4) above.
signal of 0.1 volt at 1,000 cps across the
(7) The ME-30B/U indications at 250,
150-ohm resistor in the dummy micro-
3,000, 6,000, 10,000, 15,000, and
phone.
25,000 cps must be within 2 db of
c. Using the TS-723A/U, measure the
that in (4) above.
harmonic distortion of the 1,000-cps sig-
nal at the output of the linear detector. The
harmonic distortion must not exceed 10
a. Make the following connections to the
percent.
rt unit. Use figure 119 as a guide.
Note. Do not change the input signal level.
(1) Connect the TS-382/U through the
d. Set the TS-382/U frequency to 250,
194
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