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TM 11-5820-509-35
the dummy load using the 3-foot length of RG-58/U
b. Sectionalizing Test Settings.
coaxial cable from the AN/PRA-4.
(1) General.
The extender cables and
(c) Connect the multitester (with rf
components of Cable Assembly Set AN/PRA-4 are used
probe attached) to the VTVM terminals of the antenna
during the bench tests of Radio Receiver-Transmitter
simulator using the 5-foot length of RG-58/U coaxial
RT-671/PRC-47. For these tests it is not necessary to
cable.
remove and extend the modular subassemblies, but the
dust cover must be removed to gain access to the test
(d) Connect the primary power source
points at the top of each module and beneath the power
to be used to the POWER connector on the front of RT-
amplifier compartment. Remove the dust cover using
671 /PRC-47.
the  procedures  listed  in  paragraph  3-11.
The
(e) Adjust the control knobs to provide
troubleshooting checks for the receiver portion of the
a reading of 3002 on the KILOCYCLES indicator on the
equipment differ greatly from those specified for the
front  of  RT-671/PRC-47;  then  place  the  CW-
transmitter circuits, and the test setup conditions
FSK/VOICE switch to VOICE, the XMTR PWR switch to
likewise differ.  Use the appropriate setup and initial
LO, and the OPR-TUNE switch to OPR.
procedures described in steps (2) and (3) below.
c. Sectionalizing
Trouble.
The
following
CAUTION
procedures sectionalize the malfunction to the power
Do not key the transmitter unless the
distribution, receiver-transmitter, frequency generation,
rf output is terminated in a 50-ohm
or relay control circuits of the RT-671/PRC-47.  If a
dummy load, a quarter-wave whip, or
specific symptom is indicated by the intermediate
a suitable long-wire antenna. Never
preventive maintenance checks and services performed
key the transmitter while Signal
at the organizational level, or by the short circuit tests of
Generator
SG-103/URM-25F
is
paragraph 3 4 a(4). enter the chart in that functional
connected to the ANTENNA terminal
area; otherwise, perform all steps.
of the RT-671 /PRC-47.
CAUTION
(2) Receiver Test Setup and Initial Settings
Do not perform these checks unless
the short circuit tests indicate that
further damage to the equipment is
(a) Connect the dummy load (or a 50-
unlikely.
ohm noninductive resistor) to the ANTENNA terminal of
RT-671/PRC-47 using the antenna test lead from the
(1) Preliminary Procedures.
AN/PRA-4.
(a) Energize the primary power source
(b) Connect the signal generator to the
(if separately controlled); then rotate the POWER -
ANTENNA terminal.
LIGHTS switch on the front panel of RT-671/PRC-47 to
the POWER ON position.
(c) Connect the primary power source
to be used to the POWER connector on the front of RT-
(b) Press the BATTERY TEST switch
671 /PRC-47.
on the front panel of RT-671/PRC-47 and observe that
the XMTR OUTPUT meter reads in the banded area of
(d) Connect a 300-ohm audio load to
its scale. {If this indication is not obtained, perform the
pin L of AUDIO connector on the front panel of RT-
power distribution circuit checks before proceeding
671/PRC-47; then attach multitester leads across this
further.)
resistor.
(2) Troubleshooting Chart.
(e) Set the front panel controls and the
test equipment conditions as directed in the chart of
CAUTION
Do not place the CW-FSK/VOICE
switch to CW-FSK in any of the
(3) Transmitter Test Setup and Initial Settings
following tests unless the transmitter
output is properly terminated in a
(a) Connect
the
RT-671/PRC-47
dummy load or a suitable antenna
ANTENNA terminal to the antenna simulator of AN
system.  Never switch to CW-FSK
/PRA-4.
when  the  signal  generator  is
(b) Connect the antenna simulator to
connected to the ANTENNA terminal.
3-73


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