2 1. Frequency Response Adjustments
acceptable range of values for
and Table 3-4 for HP part
numbers. See Figure 3-90 for the location of
90. On the spectrum analyzer, key in
TRACE A
Set the spectrum analyzer
controls as follows:
START FREQ . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STOP FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.5
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . -7
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB/DIV
SWEEP TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500
ms
91. On the synthesized sweeper, key in
6.0
The POWER LEVEL of the synthesized sweeper should still be leveled
to a calibrated -10.00
at 100 MHz at the spectrum analyzer RF
INPUT from step 55.
92.
Adjust 22-turn (IF Offset) potentiometer
C and
(YTX Bias) potentiometer
VC for maximum
signal amplitude at 6.0
on the spectrum analyzer display.
See Figure 3-90 for the locations of
C and
vc.
93.
On the spectrum analyzer, key in MARKER
MARKER
[
PEAK SEARCH
)
to position a marker at the peak of the displayed
6.0
signal. Adjust 17-turn (Band C Step Gain) potentiometer
GC as necessary to adjust the amplitude of
the
displayed 6.0
marker to -10.00
fO.10
Adjust
GC counterclockwise to increase the signal level, and
clockwise to decrease the signal level. If
GC does not
have sufficient range, adjust the amplitude of the displayed 6.0
marker as close as possible to -10.00
See Figure 3-90
for the location of
GC.
94.
On the spectrum analyzer, key in LOG SCALE
(
ENTER
MARKER
95.
Readjust 22-turn (IF Offset) potentiometer
C as
necessary to maximize the amplitude of the 6.0
signal on
the spectrum analyzer display.
96.
Set the synthesized sweeper controls as follows:
START FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STOP FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.5
RF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
LEVELING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .XTAL
SWEEP TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ms
SWEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONT
97.
On the spectrum analyzer, key in TRACE A
(
SWEEP TIME
)
MARKER
As the spectrum
analyzer completes each sweep, a series of approximately 23 new
should be disnlaved. as shown in Figure 3-97. The
Adjustments
