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29.
Set the controls of the second spectrum
as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . 165 MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MHz
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
dB/DIV
MARKER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
30. Press
PRESET
)
on the synthesized sweeper, and key in
330.3 MHz,
(
POWER LEVEL
)
0
31. Use a second BNC to SMB Snap-on Test Cable and an SMB adapter
to connect the cable 4 (yellow) from
IN 200-300 MHz to
the RF OUTPUT of the synthesized sweeper.
32. Set the RF Section LINE switch to ON, and key in
(
CENTER FREQUENCY
)
42.57 MHz,
(
FREQUENCY SPAN
)
0 Hz.
17.
Loop Phase Lock Adjustments
Adjustments
165 MHz NULL,
160 MHz NULL,
and
170 MHz NULL are sealed at the factory and normally
do not require readjustment unless a component failure has occurred.
verify their proper adjustment, skip to step 39.
33.
34.
35.
36.
37.
38.
39.
40.
41.
Adjust
165 MHz NULL,
160 MHz NULL, and
170 MHz NULL fully clockwise.
Adjust
170 MHz NULL to minimize the amplitude of
the 170 MHz signal displayed on the second spectrum analyzer.
Refer to Figure 3-78 for the location of
170 MHz NULL
adjustment.
On the synthesized sweeper, key in
325.3 MHz.
Adjust
165 MHz NULL to minimize the amplitude of
the 165 MHz signal displayed on the second spectrum analyzer.
Refer to Figure 3-78 for the location of
165 MHz NULL
adjustment.
On the synthesized sweeper, key in
320.3 MHz.
Adjust
160 MHz NULL to minimize the amplitude of
the 160 MHz signal displayed on the second spectrum analyzer.
Refer to Figure 3-78 for the location of
160 MHz NULL
adjustment.
On the synthesized sweeper, key in
260.3 MHz.
On the second spectrum analyzer, press
[
CENTER FREQUENCY
)
100
MHz
SPAN
)
6 MHz MARKER
SEARCH
)
to position a
marker on the peak of the displayed 100 MHz signal, and verify
that the output power level of the
IF is at least -14
If it is not, a lower
can be selected for factory-select
component
to improve the impedance match between
the double-balanced mixer
and the IF Input Amplifier
circuit on
IF Assembly. Refer to Table 3-3 for the
acceptable range of values for
and to
3-4 for HP
part numbers; refer to Figure 3-78 for the location of
On the synthesized sweeper, key in
[
START
300.3 MHz.
Adjustments