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|  TM 11-5820-509-35
4-10. Receiver Image Rejection Test
(1) Connect the test equipment to Radio
Receiver-Transmitter RT-671/PRC-47 as shown in
a. Test Equipment and Material.
(2) 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 T@723A/U.
POWER-LIGHTS switch of RT-671/PRC 47 to POWER
(4)
Audio load, 300-ohm, 1-watt composition
ON. Permit the equipment to stabilize at least 5
resistor.
minutes before beginning the procedures shown in the
(5) Primary power source: 115-volt, 400-Hz,
chart below.
single-phase, at 3 amp. 26.5-volt, dc, 11 amperes
approx.
c. Procedure.
b.
Test Conditions and Equipment Connections.
Test
Radio
equipment
control
Test
Performance
Step
settings
settings
procedures
standards
1
a. Adjust signal generator to
Adjust frequency control knobs
a. Read audio output voltage
a. Record output voltage for
2226 kHz; set output level
to 2225 on KILOCYCLES
across 300-ohm audio load.
reference below.
to 5 0 microvolts.
indicator; CW-FSK/VOICE to
VOICE; OPR-TUNE to OPR;
VOLUME control to maximum
clock wise.
b. Adjust signal generator to
b. Verify that audio output
3224 kHz, raise output
voltage across 300-ohn
not less than 50,000 microvolts.
level until voltage across
audio is same as step 1a
300-ohm audio load is
Record signal generator out-
same as in step 1a.
put level.
2.
a. Adjust signal generator to
Same as step 1 except set fre-
a. Read audio output voltage
a. Record output voltage for ref-
1 1776 kHz; set output level
quency control knobs to
across 300-ohm audio load.
erence below.
to 5.0 microvolts.
1 1775 on KILOCYCLES
b. Adjust signal generator to
indicator.
b. Verify that audio output
12774 kHz; raise output
voltage across 300-ohm audio
not less than 1580 microvolts.
level until voltage across
load is same as step 2a Record
300-ohm audio load is
signal generator output level
same as in step 2a
Change 1 4-6
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