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4.3.4.2
RF Filter Testing And Troubleshooting
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RF Filter Testing and Troubleshooting .includes a checkout procedure and
fault isolation information.
A Signal Generator, an RF Voltmeter, and a Digital
Voltmeter (see Table 4-1) are required to perform the tests outlined below.
4.3.4.2.1
RF Filter Checkout Procedure
Perform the following procedure in the sequence given.
If any specified
result is not obtained, refer to paragraph 4.3.4.2.2 for fault isolation.
1.
Disconnect A2P1 from A3A1J1 on the Input Converter.
2.
Connect an RF Voltmeter and 50 ohm adapter to A2P1.
3.
Connect the output of a Signal Generator to A2J1 on
the rear panel of the receiver.
i
4.
Set the RF Voltmeter to the 0 dBm range.
,
5.
Set the Signal Generator output frequency to 1.0 MHz
j
and output level to 0 dBm.
6.
The
RF
Voltmeter
should
indicate a
level
between
0 dBm and -1.0 dBm.
7.
Tune the Signal Generator to 10 MHz and 20 MHz, and
30 MHz successively, maintaining the output level at
0 dBm for each frequency.
The filter output level
should not be less than -3.0 dBm for each frequency.
8.
Disconnect the test equipment from the receiver.
9.
Reconnect A2P1 to A3A1J1.
4.3.4.2.2
RF Filter Fault Isolation
1.
Remove the filter
from the receiver and
remove the
filter's protective cover.
2.
Check all capacitors and
the two
Zener diodes for
leakage to ground.
3.
Check all inductors for continuity.
4.
Field realignment of the filter is not practical.
4-17
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