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Page Title:
Transmitter Output Meter Sensitivity Test |
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|  TM 11-5820-509-35
Test
Radio
equipment
control
Test
Performance
Step
settings
settings
procedures
standards
12
a. Same as step 1a; set
a. Disconnect 26.5 volt dc
a. Read rf voltage across
a. Same as step 1a.
switch on antenna
primary power source;
dummy load with 115-volt
simulator to 2,000 kHz
connect 115 volt ac
ac primary power source.
position.
primary power
source;
repeat paragraph 4-
14c and step 1a of this
chart.
b. n/a
b. n/a
b. Immediately return
b. n/a
OPR-TUNE switch to
OPR.
c. Same as step 1c.
c. Same as step 1c.
c. Read rf voltage across
c. Same as step 1c.
dummy load.
d. n/a
d. n/a
d. Immediately return
d. n/a
OPR-TUNE switch to
OPR; then place XMTR
PWR switch to LO and
POWER-LIGHTS switch
to POWER OFF.
4-15. Transmitter Output Meter Sensitivity Test
KILOCYCLES indicator to 2000; place CW-FSK/VOICE
switch to VOICE: XMTR PWR switch to LO; and OPR-
TUNE switch to OPR.
a. Test equipment and Material
(3) Place the turns-counters of POWER
(1) Antenna Simulator (p/o Cable Assembly
AMPLIFIER TUNE and POWER AMPLIFIER LOAD
Set AN/PRA-4) (2) Dummy Load DA-75/U (3)
controls to the settings recommended on the LOAD-
Multimeter ME-26A/U (4) Primary power source: 26.5-
TUNE chart on the front of the receiver-transmitter.
volt, dc, 11 amperes approx.
CAUTION
b. Test Conditions and Equipment Connection.
Before
making
the
following
(1) Connect the test equipment to Radio
measurements, resonate the POWER
Receiver-Transmitter RT-671/PRC-47 as shown in
AMPLIFIER TUNE and POWER
AMPLIFIER LOAD controls on the
(2) Connect the primary power source to the
front of the receiver-transmitter for
receiver-transmitter.
maximum deflection on the XMTR
(3) Turn on the test equipment and place the
OUTPUT meter. Use the OPR-TUNE
POWER-LIGHTS switch on RT-671/PRC-47 to POWER
switch to control power amplifier
ON. Permit the equipment to stabilize at least 5
plate power. Do not permit the power
minutes before beginning the procedures shown in the
amplifier to operate for more than a
chart below.
few seconds in the unloaded or off-
resonant condition, serious damage
c. Procedure.
can result. Between each procedural
(1) Set the selector switch on the antenna
step of the following chart, resonate
simulator to the 2000 kHz position.
the power amplifier output circuit at
(2) On RT-671/PRC-47.Set the
the new operating frequency.
Test
Radio
equipment
control
Test
Performance
Step
settings
settings
procedures
standards
I
a. n/a
a. Place OPR-TUNE switch
a. Adjust M ADJ control
a. Control must be able tc
to TUNE.
until XMTR OUTPUT
adjust pointer to mid-
pointer is at midscale.
scale.
b. n/a
b. n/a
b. Immediately return
b. n/a
OPR-TUNE switch to
OPR.
2
a. n/a
a. Place XMTR PWR
a. Repeat step 1a.
a. Same as step 1a.
switch to HI; then place
OPR-TUNE to TUNF
b. n/a
b n/a
b. Immediately return
b. n/a
OPR-TUN E switch to
OPR: and place XMTR
PWR switch to LO.
4-13
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