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Figure 119. Transmitter final test setup, block diagram
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TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
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Overall Distortion Test


INPUT RETURN terminals on the
PUT RETURN terminals on the
audio test box.
audio test box.
Connect a 600-ohm load between
Connect a 600-ohm load between
(3)
(3)
the SPEAKER and AF OUTPUT
the SPEAKER and AF OUTPUT
RETURN terminals on the audio
RETURN terminals on the audio
test box.
test box.
Connect Electronic Voltmeter ME-
Connect Electronic Voltmeter ME-
(4)
(4)
30B/U as required in the proce-
30 B/U across the 150-ohm resistor
dures below.
in the dummy microphone (fig. 119,
Connect the audio test box 10-pin
note 2) for input signal voltage
(5)
measurements.
connector to either AUDIO recep-
tacle on the rt unit front panel.
Connect the ME-30B/U between the
(5)
SPEAKER and AF OUTPUT RE-
Connect the feedthrough crossarm
(6)
TURN terminals on the audio test
of Variable Attenuator CN-318/U
box for output signal decibel meas-
between the ANT. jack on the rt unit
urements.
AN/URM-43A.
Connect the audio test box 10-pin
(6)
Connect the variable adjustment
connector to either AUDIO recep-
(7)
leg of the CN-318/U directly to
tacle on the rt unit front panel.
Connect Radio Frequency Watt-
the input of the linear detector.
(7)
Connect Multimeter ME-26/U to
meter AN/URM-43A to the ANT.
(8)
the output of the linear detector.
jack on the rt unit front panel.
b. Normal Audio Test Procedure.
b. Procedure.
(1) Key the transmitter by connecting
(1) Key the transmitter by connecting
a lead between the RADIO CONT
a lead between the RADIO CONT
LINE and CONT LINE RETURN
LINE and CONT LINE RETURN
terminals on the audio test box.
terminals on the audio test box.
(2) Adjust the CN-318/U for 0.5 volt
(2) Set the TS-382/U to 1,000 cps; set
dc on the ME-26/U.
the input signal level for 0.1 volt
on the ME-30B/U (a(4) above).
(3) Set the TS-382/U to 1,000 cps.
Connect the ME-30B/U across the
(3) Record the output signal level (a(5)
150-ohm resistor in the dummy
above).
(4) Reduce the input signal level to 0.05
microphone (fig. 119, note 2), and
adjust the TS-382/U signal level
volt (a(4) above).
for 0.05 volt on the ME-30B/U.
(5) Record the output signal level (a(5)
above). The output signal level must
Record the TS-382/U output level
be at least 3 db below the level
meter indication.
(4) Connect the ME-30B/U to the out-
given in (3) above.
put of the linear detector. Record
(6) Increase the input signal level to
the level of the demodulated output
0.4 volt (a(4) above).
signal, in decibels, indicated on the
(7) Record the output signal level (a(5)
ME-30B/U.
above). The output signal level must
(5) Set the TS-382/U to 100, 250, 3,000,
be not more than 2 db above the
6,000 and 10,000 cps and record
level given in (3) above.
the ME-30B/U indication (in db) at
the linear detector output for each
157. Transmitter Audiofrequency Response
frequency.
a. Connections for Normal Audio Test.
N o t e . Maintain a constant signal level
Use figure 119 as a guide.
from the TS-382/U at the above frequen-
(1) Connect Audio Oscillator TS-382/
cies by maintaining the TS-382/U output
level  meter  indication  recorded  in  (3)
U to the dummy microphone input.
above.
(2) Connect the dummy microphone
(6) The ME-30B/U indications at 100
output to the AF INPUT and AF IN-


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