Quantcast Figure 10-4. Antenna Tuner A2A2 Performance Test (Sheet 1 of 3)

 

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Figure 10-3. Antenna Tuner A2A2 Performance test Setup
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TM-11-5820-919-40-2 Radio Set AN/PRC-104(A) (NSN
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Figure 10-4. Antenna Tuner A2A2 Performance Test (Sheet 2 of 3)


TM 11-5820-919-40-2
ANTENNA TUNER PERFORMANCE TEST
NOTE 1:
Changing the MODE switch from V-TR to V-RCV to V-TR causes a tune start signal
to be routed from the modulator/demodulator. This will cause all capacitive and
inductive elements to be removed from the rf pathway. When PIT or CW key is
closed. the inductors and capacitors are added.
NOTE 2:
A voltage difference of 1.5 vac or greater across the coil indicates that the relay is
open. The coil is then in the rf pathway. After a time start, and before PTT is
closed, all coil relays should be closed.
NOTE 3:
If a coil is replaced, be sure that its inductance is exactly (11 percent) one-half of
next larger coil.
NOTE 4:
Unless otherwise specified, all voltage measurements taken with respect to ground.
NOTE 5:
Hybrid binary count faults can be investigated in the following way:
1. Monitor TP10 with DVM and record voltage measurement.
2. Set TP10 to 0v (this disables comparator) by adjusting R4.
3. Monitor bases of S and R driver transistors for RL1 thru E111 and came pare
waveforms to those of a functional module (see that the " "count is performed
L
properly).
4. Set TP10 to +6v by adjusting R4.
5. Monitor TP8 and TP9 with DVM and record voltage measurement.
6. Set TP8 and TP9 to +0v (this disables comparator) by adjusting R2 and R3,
respectively.
7. Monitor bases of S and R driver transistors for KC1 thru KC8 and compare
waveforms to those of a functional module (see that the " "count is performed
C
properly).
8. Reset TP8, TP9, TP10 to the values recorded in steps 1 and 5.
NOTE 6:
Component failures due to untraceable faults require special handling at a factory or
depot location using a test fixture and a vector impedance meter. If performance is
not satisfactory, and a tune-fault coca not occur, then refer module to fifth echelon
repair level.
Figure 10-4. Antenna Tuner A2A2 Performance Test (Sheet 1 of 3)
92


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