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|  TM 1 1-5820-509-35
Test
Radio
equipment
control
Test
Performance
Step
settings
settings
procedures
standards
6
Adjust signal generator output
Same as step 1.
Verify that audio output voltage
Frequency is not less than
frequency above 2226.7
across 300-ohm audio load is
2228.000kHz.
kHz until the voltage across
6db below reading of step 4.
the 300-ohm audio load is
Record signal generator
6db below the value shown
frequency
in step 4.
4-9. Receiver If. Rejection Test
b. Test Conditions and Equipment Connections.
(1) Connect the test equipment to Radio
a. Test Equipment and Materials.
Receiver-Transmitter RT-671/PRC-47 as shown in
(3) Connect the primary power source to the
(1)
Signal Generator SG-103/URM-25F
receiver-transmitter.
(2)
Frequency Counter AN/URM-79/U
(3) Turn on the test equipment and place the
(3)
Spectrum Analyzer TM-723A/U.
POWER-LIGHTS switch of RT-671/PRC-47 to POWER
(4)
load, 300 ohm, 1-watt composition
ON. Permit the equipment to stabilize for at least 5
resistor.
minutes before beginning the procedures shown in the
(5) Primary power source: 115-volt, 500 Hz,
chart below.
single-phase, 3 amps.
26.5-volt, dc, 11 amperes
c. Procedure.
approx.
Test
Radio
equipment
control
Test
Performance
Step
settings
settings
procedures
standards
1
Adjust signal generator to
Adjust frequency control knobs
Read audio output voltage
Record output voltage for ref-
2226 kHz; set output level
to 2225 on KILOCYCLES in-
across 300-ohm audio load.
erence below.
to 2.0 microvolts.
dicator; CW-FSK/VOICE to
VOICE; OPR-TUNE to OPR;
VOLUME control to maxi-
mum clockwise.
2
Adjust signal generator to 499
Same as step 1.
Verify that audio output voltage
Level not less than 20,000 micro-
kHz; increase output level to
across 300-ohm audio load is
volts.
obtain same output voltage
same as step 1. Record signal
across 300-ohm audio load
generator output level.
As in step 1.
3
Adjust signal generator to
Same as step 1 except set fre-
Read audio output voltage
Record output voltage for
11776 kHz; set output level
quency control knobs for
to 2. Microvolts.
11775 on KILOCYCLES
indicator.
4
Same as step 2.
Same as step 3.
Verify that audio output voltage
Level not less than 20,000
across 300-ohm audio load is
microvolts.
same as step 3. Record signal
generator output level.
Change 2 4-5
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