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|  TM 11-5820-509-35
Test
Radio
equipment
control
Test
Performance
Step
settings
settings
procedures
standards
6
Same as step 2.
Same as step 5.
Read audio output voltage
Reading in this step must not
across 300-ohm audio load.
exceed 3.16 times the reading
in step 5.
7
Same as step 1 except set out-
Same as step I except set fre-
Repeat procedure of step 1 at
Record output voltage for ref-
put to 8226 kHz.
quency control knobs for
8225 kHz.
erence below.
8225 on KILOCYCLES in-
dicator.
8
Same as step 2.
Same as step 7.
Read audio output voltage
Reading in this step must not ex-
across 300-ohm audio load.
ceed 3.16 times the reading in
step 7.
9
Same as step 1 except set
Same as step 1 except set
Repeat procedure of step 1
Record output voltage for
output to 10226 kHz.
frequency control knobs to
at 10225 kHz.
reference below.
10225 on KILOCYCLES
indicator.
10
Same as step 2.
Same as step 9.
Read audio output voltage
Reading in this step must not ex-
across 300-ohm audio load.
ceed 3.16 times the reading in
step 9
4-8. Receiver Selectivity Tests
(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
reciever-transmitter.
(2) Frequency Counter AN/URM-79/U.
(3) Turn on the test equipment and place the
(3) Spectrum Analyzer TS-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 for at least 5
resitor.
minutes before beginning the procedures shown in the
(5) Primary power source: 115-volt, 400-Hz,
chart below.
single-phase, 3 amps.
26.5-volt, dc, 11 amperes
c. Procedure.
approx.
b. Test
Conditions
and
Equipment
Connections.
Test
Radio
equipment
control
Test
Performance
Step
settings
settings
procedures
standards
1
Adjust signal generator to 2226.7k
Adjust frequency control
Read audio output voltage
Record output voltage for
2226.7 kHz; set output level
knobs to 2225 on KILO-
across 300 ohm audio load.
reference below.
to 2.0 microvolts.
CYCLES indicator; CW-FSK/
VOICE to VOICE; OPR-TUNE
to OPR; VOLUME to maximum
clockwise stop.
2
Increase output of signal gen-
Same as step 1.
Verify that audio output voltage
Frequency is not less than 2223.7
erator to 2,000 microvolts
across 300-ohm audio load is
kHz.
and reduce output frequency
same as in step 1. Record sig-
until voltage across 300-ohm
nal generator frequency.
audio load reads same as
step 1.
3
Do not adjust signal generator
Same as step 1.
Verify that audio output voltage
Frequency is not more than
output level but increase out-
across 300-ohm audio load is
2229.7 kHz.
put frequency above 2225 kHz
same as step 1. Record signal
until output across 300-
Generator frequency
ohm audio load reads same
as step 1.
4
Same as step 1.
Same as step 1.
Repeat procedure of step 1.
Record output voltage across
300-ohm audio load for reference
below.
5
Adjust signal generator out-
Same as step 1.
Verify that audio output voltage
Frequency is not more than
put frequency below 2226.7
across 300-ohm audio load is
2225.300 kHz.
kHz until the voltage across
6db below reading of step 4.
The 300-ohm audio load is
Record signal generator fre-
6db below the value shown
quency.
In step 4.
Change 2 4-4
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