2 1. Frequency Response Adjustments
STOP FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.6
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . dB/DIV
SWEEP TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
168. On the synthesized sweeper, key in
13.1
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.
169.
170.
171.
172.
173.
174.
175.
176.
If the
YTX, or
YTX Driver
Assembly have been repaired or replaced, adjust (YTX Delay
Compensation) potentiometers
D2 and
D3
clockwise from
counterclockwise.
On the spectrum analyzer, key in MARKER
[
PEAK SEARCH
),
On the spectrum analyzer, press
PEAK
)
and wait for the
preselector peaking routine to complete. Record the Preselector
DAC
in the 1 second SWEEP TIME column of
3-15.
3-15.
Preselector Delay Compensation DAC Values
Preselector DAC Value
Trial Number
5
Average
Repeat step 171 to record four additional Preselector DAC value
entries in the SWEEP TIME column of
3-15.
On the spectrum analyzer, key in SWEEP TIME
MARKER
(
PEAK
SEARCH_).
On the spectrum analyzer, press
and wait for the
preselector peaking routine to complete. Record the Preselector
DAC
in
the
SWEEP TIME column of
3-15.
Repeat step 174 to record four additional Preselector DAC
entries in the
SWEEP TIME column of
3-15.
Calculate the average Preselector DAC
for the 1 second
SWEEP TIME and (AUTO) SWEEP TIME settings, and enter them
in
3-15. Subtract the average Preselector DAC
for 1
second SWEEP TIME from the value for
SWEEP TIME,
and record the difference in the following line:
preselector DAC
difference:
Adjustments
