16. Second IF Gain Adjustment
Assembly Adjusted
Al5 RF Assembly
Related Performance Test
IF Input Amplitude Accuracy
Description
The gain of the Second IF (between A15J801 INT Second IF and the third mixer) is set to
12
dB.
Note
This adjustment is necessary after replacing either
A15Al
Second IF Amplifier
or A15U802 Second IF pad.
Equipment
No test equipment or test setup is required for this adjustment procedure.
Procedure
1. Set the HP 8560A
m
switch off, disconnect the power cord, and remove the analyzer
cover. Fold down the Al5 RF and Al4 Frequency Control assemblies. Prop up the Al4
Frequency Control assembly.
2. Remove the shield covering the third converter and
A15Al
Second IF Amplifier. See
Figure
2-
19.
3. Read the gain printed on the
A15Al
Second IF Amplifier label. Select a value for A15U802
from Table 2-13 based upon the gain of the Second IF Amplifier.
4. Reinstall the shield on the Al5 assembly.
5. Perform the External Mixer Amplitude Adjustment.
Note
If the second IF input switch is repaired, there might be insufficient range in
the External Mixer Amplitude Adjustment. If this is the case, select a new
value for A15U802. Greater attenuation values of
U802
will lower the signal
amplitude, and lower attenuation values will increase the signal amplitude.
2-60 Adjustment Procedures
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