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PEAK are sealed at the factory and normally do
readjustment unless a component failure has occurred. lb verify their
proper adjustment, skip to step 7.
6. Adjust AlOA4L16 160 MHz PEAK and AlOA4L17 160 MHz PEAK
to maximize the amplitude of the 160 MHz signal displayed on the
second spectrum analyzer. The two adjustments are interactive;
repeat the adjustment as necessary to ensure maximum signal
amplitude. Refer to Figure 3-80 for the location of AlOA4L16 160
MHz PEAK and AlOA4L17 160 MHz PEAK adjustments.
7. Adjust AlOA4C50 160 MHz PEAK to maximize the amplitude of
the 160 MHz signal displayed on the second spectrum analyzer. If
after adjustment AlOA4C50 is completely open, select a lower
value for factory-selected component AlOA4C49; conversely,
if after adjustment AlOA4C50 is completely closed, select a
higher value for factory-selected component AlOA4C49. Refer to
HP part numbers for AlOA4C49, and to Figure 3-80 for the
location of AlOA4C50 160 MHz PEAK and AlOA4C49.
8. On the RF Section, key in
(
)
100 kHz, SWEEP cm), TRACE A
FREQUENCY SPAN
9. Set the controls of the second spectrum analyzer as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 MHz
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LAUTO)
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 dBm
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB/DIV
MARKER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . m
10. On the second spectrum analyzer, press MARKER
position the marker on the peak response. If this level is not at
least -42 dBm, repeat steps 3 through 10.
11. Disconnect the second spectrum analyzer from SMB test
connector AlOA4J4. Connect the second spectrum analyzer to
Refer to Figure 3-80 for the location of AlOA4TP3.
17. 20130 Loop Phase Lock Adjustments
not
require
HP Part Number
0160-3874
0160-4520
0160-4521
0160-4522
0160-4289
(
)
42.450 MHz,
CENTER FREQUENCY
(
)
to
PEAK SEARCH
Adjustments 3-l 57
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