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SPECIAL TOOLS, MATERIALS, AND FABRICATED TEST CABLES AND FIXTURES - TM-11-5820-919-40-20101
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TM-11-5820-919-40-2 Radio Set AN/PRC-104(A) (NSN
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Appendix A. REFERENCES - TM-11-5820-919-40-20103


TM 11-5820-919-40-2
ANTENNA TUNER A2A2 ALIGNMENT
The alignment procedure is to be used in either of these situations: (1) the performance test calls a potentiometer out of adjustment, or (2) one of the following is
replaced:
1.
Comparator/Control Hybrid A1
2.
RF Sensor Bridge
The procedure consists of a preliminary setup and adjustment procedure. The adjustment procedure can be shortened by adjusting R1, R2, B3 and R4 to the values
given in step 13 below. The complete procedure need only be run if work has been done on the rf Sensor Bridge.
PRELIMINARY SETUP
ADJUSTMENT
ADJUSTMENT (cont)
1. Connect test radio as in figure 10-5.
1. Close CW KEY and switch MODE to V-RCV and
10. Adjust B3 until the 1.5 vswr reference voltage,
back to V-TR. This generates a tune start pulse.
TP9, is the same as that noted in step 9.
2. Connect an rf signal generator to the input of the
power amplifier module at A1J1. Set the level to
2. Ground (continuously) E7 of ribbon cable.
11. Adjust B2 until the 1.6 vswr reference voltage at
-100dbm and the frequency to 2.000 MHz.
TP8 is +10.6v higher than that of TP9.
3. Increase level of rf signal generator until TP13 is
3. Remove the antenna tuner module from the test
+10v rms. This corresponds to 2 watts in a 50-ohm
12. Adjust B1 until the voltage at TP7 is +3.0v.
bed radio. Separate the two halves of the antenna
system.
tuner module which is to be aligned, except for the
13. The following are typical settings after alignment:
interconnecting ribbon cable.
4. Measure the dc output of the Z sensor at TP12.
Record voltage at TP12.
ALC REM
R1
TP7
+3.0v
4. Plug the antenna tuner module to be aligned into
1.6 REP
R2
TP8
+4.3v
the test bed radio.
5. Adjust R4 until the Z comparator reference
1.5 REP
R3
TP9
+3.7v
voltage, TP10, is the same as that measured in step
ZREF
R4
TP10
+3.3v
5. Connect the 100 ohm load (figure 3-11E, TM 11-
4.
5820-919-40-1 to the radio set BNC connector.
14. Turn radio off and disconnect test equipment.
6. Replace the 100 load with the 130-ohm load (figure
Reassemble the two boards of the antenna tuner
6. Set the radio control to the following:
3-11-F, TM 11-5820-919-40-1).
module being very careful to avoid pinching the ribbon
cable.
a.
FREQUENCY KHz to 02,000.0
7. Adjust the rf signal generator so that the voltage at
b.
MODE to V-TR
TP13 varies between +7 ant +14v (+7v = 1 watt, +14v
c.
SB to USB
= 4 watts) and measure the output of the vswr
d.
VOLUME to on
detector at TP11. But, do not stay at the 4-watt level
e.
ANT SEL to BNC
for any length of tine.
8. Adjust the level compensation resistor, R7, for
minimum variation in do output of TP11 as performed
in step 7.
9. Once R7 is adjusted, adjust the rf signal generator
so that TP13 is +10v rms, Note the voltage at TP11.
96


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