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TM 11-5820-509-35
Symbol
Description
Mfgr Part No.
Mfgr Code
VR1
Semiconductor device, diode, 20 V 5%
1N2984B
XDS1, XDS2
Light (FSN 6210-825-2051)
101-3830-9
72619
Lens, p/o XDS1 (FSN 6210-511-8208)
101-972
72619
Lens p/o XDS2 (FSN 6210-174-4680)
101-974
72619
XF1
Fuseholder (FSN 5920-284-7144)
HKPH
71400
Note. All manufacturer's codes are 5-digit numbers. The corresponding
manufacturer's name and address are
listed in SB 708-42 Catalog Handbook (H4-2).
6-18.
Teat Fixture for Amplifier-Modulator AM-
(8) XMIT RCVR switch.  This toggle switch
3507/PRC-47
selects the transmit mode, or the receive mode of
operation for the module under test.
a. The teat fixture for Amplifier-Modulator AM-
(9) AGC ON-OFF switch. This toggle switch,
3507/PRC-47 contains all switches, jacks, tamps, and
when placed in the ON position, applies positive agc
meter necessary to electrically test and adjust the
bias to the module under test.
module without providing a complete AN/PRC-47 Radio
(10) AGC
ADJUST
control.
This
Set. Power for the test fixture and the module under
potentiometer varies the magnitude of bias applied to
test is provided externally and is connected to the test
the agc bias input to the module being tested.
fixture by a specially fabricated cable attached to power
(11) Test jacks and coaxial connectors are
connector J3 at the rear of the teat fixture.
provided for the attachment of signal leads and test
b. The operating controls on the front panel of the
equipment and are self-explanatory.
test fixture (fig. 6-5) perform the following functions:
c. The piece parts required for fabrication of the
(1) POWER ON-OFF switch.  This toggle
test fixture are listed in the following chart and
switch controls the +20 volts dc the +6 volts dc and the -
suggested parts placement is shown in figures 6-19 and
110 volts dc input voltages to the test fixture and the
6-20.  Schematic diagram (fig.  716) illustrates the
module.
internal circuit of the test fixture.
(2) POWER lamp. This indicator is lit when
d. The following calibration procedure is required
power is connected to the +20 volts dc input of the teat
prior to initial use of the test fixture, and should be
fixture and the POWER ON-OFF switch is in the ON
verified from time to time prior to its use.
position.
(1) Remove the dust cover from the test
(3) POWER 1/2 AMP 28 VDC fuse.  This
fixture and connect the 20 volts dc power supply to the
protective device is connected in the +20 volts dc
power cable.
primary power circuit to protect it from overload.
(2) Apply primary power to the 20 volts dc
(4) ALC BIAS ON-OFF switch.  This switch
power supply and adjust the power supply output
controls the +6 volt dc alc bias applied to the module
voltage to 20.0 0.5 volts.
under test.
(3) Connect  the  frequency  counter  and
(5) ALC  BIAS  ADJUST  control.
This
multimeter rf probe to connector J2 at pin A2.
potentiometer varies the magnitude of effective bias on
(4) Place the POWER ON-OFF switch on the
the -alc line to the module being tested
test fixture to ON and permit the test fixture to stabilize
(6) MICROAMPERES meter.  This 0 - 50
for at least five minutes. Place the XMIT-RCVR switch
microammeter indicates the amount of alc bias current
to XMIT.
flowing in the module.
(5) Adjust capacitor C6 (fig. 6-20 and fig. 7.
(7) METER RANGE 50 - 200 switch.  This
16) until the frequency counter indicates 500,000.00
switch, when placed in the 200 position, connects a
1.0 Hz; then adjust potentiometer R4 (fig. 6-20 and fig.
shunt across MICROAMPERES meter to extend its
7-16) for a multimeter reading of +1.5 volts rms.
range to 200 microamperes.
6-41


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