HP 8566B Adjustment Manual page 292

17. 20/30 Loop Phase Lock Adjustments
3-152 Adjustments
42. On the second spectrum analyzer, press
(
MHz MARKER
PEAK SEARCH
the displayed 140 MHz signal, and verify that the output power
level of the PLLl IF is at least -14 dBm.
If it is not, slightly readjust AlOA3Lll 165 MHz NULL to increase
the amplitude of the 140 MHz signal displayed on the second
spectrum analyzer to -14 dBm. Refer to Figure 3-78 for the
location of AlOA3Lll 165 MHz NULL adjustment.
43. Key in MARKER
spectrum analyzer to position the peak of the 140 MHz signal at
the top graticule line. Press MARKER la] on the second spectrum
analyzer.
44. On the synthesized sweeper, key in
[
45. Press
CENTER FREQUENCY
second spectrum analyzer. Allow the synthesized sweeper to tune
slowly from 320.3 MHz to 326.3 MHz, noting the corresponding
160 MHz to 166 MHz signal on the display of the second spectrum
analyzer.
The corresponding 160 MHz to 166 MHz signal might be below the
displayed noise level on the second spectrum analyzer.
46. On the second spectrum analyzer, press MARKER
to position the second marker on
MHz and 166 MHz. This level should be at least 60 dB down from
the level of the 140 MHz signal in step 42.
47. Set the RF Section LINE switch to STANDBY. Disconnect the
second spectrum analyzer from AlOA3J3 OUT PLLl IF, and
disconnect the synthesized sweeper from the cable 4 (yellow).
48. Reinstall AlOA3 PLLl IF Assembly in the RF Section. Reconnect
the cable 6 (blue) to AlOA4J2 OUT 160-166 MHz, the cable 4
(yellow) to AlOAlJ3 OUT 200-300 MHz, and the cable 3 (orange)
to AlOA3J3 OUT PLLl IF.
(
CENTER FREQUENCY
]
to position a marker on the peak of
], [MKR +
SEARCH REF
)
FREQ
)
163 MHz TRACE A (j-1 on the
the
peak response between 160
)
140
on the second
320.3 MHz
[ )
PEAK SEARCH