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15.
Set LINE switch to STANDBY. Adjust A7L2 one-half turn
counterclockwise before placing A7 249 MHz PLO in HP 8568B
Spectrum Analyzer without extender. (Leave DVM connected to
16.
Set LINE switch to ON and key in @KKK) 1. DVM indication
should be between +5.2 V dc and +6.0 V de.
17.
Press 2 (RECALL 2). DVM indication should be between + 12.9 V
dc and + 16.9 V dc. Disconnect DVM from A7TPl.
Set LINE switch to STANDBY and place A7 249 MHz PLO on
18.
extender.
19.
Set LINE switch to ON, press
as follows:
[
C E N T E R F R E Q U E N C Y
FREQUENCY SPAN)
20.
Disconnect cable from A7Jl and connect cable 89 (gray/white) to
one branch of a tee. Using a short coaxial cable (see Note below),
connect the other branch of the tee back to A7Jl. Connect the
stem of the tee to the HP 8566A/B Spectrum Analyzer RF INPUT.
Note
The short cable 9 (white) in the IF-Display Section (A3A9J2 to
reconnect the cable 9 (white) when finished.
21. Press @?G?iG] on the HP 8566A/B Spectrum Analyzer and
key in
22. On the HP 8566A/B Spectrum Analyzer, key in
[
FREQUENCY SPAN
-50 dBm, and CATTEN] 0 dB.
23. On the HP 8566A/B Spectrum Analyzer, turn
and set
Analyzer. Press
24. Disconnect cable from the HP 8566A/B Spectrum Analyzer RF
INPUT and connect cable (from tee) to PRE AMP input of HP
25. Adjust A7 500 kHz TRAP adjustments A7L15 and A7L17 to null
the 500 kHz sideband displayed on the spectrum analyzer. The
500 kHz sideband should be less than -90 dBm. See Figure 3-60
for location of adjustments.
Press (SAVE_) 1 on HP 8568B Spectrum Analyzer. Set LINE switch
26.
to STANDBY and place A7 249 MHz PLO in HP 8568B Spectrum
Analyzer without extender (leave tee connected).
27.
Set LINE switch to ON and press CRECALL) 1. Verify that 500 kHz
remains less than -90 dBm in amplitude.
28. Disconnect tee and reconnect cable 89 (gray/white) to A7J 1.
14. 249 MHz Phase Lock Oscillator Adjustments
) . . . . . . . . . . . . . . . . . . . . . . . .
5 MHz,
(
)
FREQUENCY SPAN
and t-1.
)
SEARCH
10 kHz,
)
to 500 kHz on the HP 8566A/B Spectrum
)
STEP SIZE
[
CENTER FREQUENCY
and set the analyzer
),
PRESET
16.5 MHz
0 Hz
. . .
1547 MHz,
[
)
CENTER FREQUENCY
[
SIGNAL TRACK
300 Hz,
[
REFERENCE LEVEL
off [
SIGNAL TRACK
then a key.
),
Adjustments 3-l 09
),
)
_]
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