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14. 249 MHz Phase Lock Oscillator Adjustments
Procedure 1.
Place instrument on right side with IF-Display Section facing right
as shown in Figure 3-59.
2.
Set LINE switch to ON and press
3.
Connect DVM to A7TPl and ground to A22TP12.
4.
Key in
[
CENTER FREQUENCY
on HP 8568B.
5.
Adjust A7 PLO A7C3 for DVM indication between +5.2 V dc and
P H A S E L O C K O S C I L L A T O R
Location of 249 MHz Phase Lock Oscillator Adjustments
6.
Key in
FREQUENCY
7.
DVM indication should be between + 12.9 V dc and + 16.9 V dc. If
DVM indication is within the given range, disconnect DVM from
LINE switch to STANDBY, and place A7 249 MHz PLO on extender
(with DVM still connected to A7TPl).
8.
Set LINE switch to ON and key in [RECALL_) 2 on HP 8568B
S p e c t r u m A n a l y z e r .
9.
Adjust A7 PLO A7C3 for DVM indication of + 13.0 ho.1 V dc.
10.
Key in
[
CENTER FREQUENCY
Adjust A7 PLO A7L2 for DVM indication of +5.2 f0.05 V dc.
11.
properly adjusted.)
12.
Key in [=J 2 and adjust A7C3 for + 13.0 fO.l V dc at A7Pl.
13.
Press 1 (RECALL 1) and adjust A7L2 for +5.2 rtO.05 V dc.
14.
Repeat steps 12 and 13 until A7C3 and A7L2 need
adjustment.
].
PRESET
17.6 MHz and
)
[
FREQUENCY SPAN
Figure 3-60.
37.1 MHz.
]
17.6 MHz,
)
0 Hz
)
0 Hz, and
]
SPAN
further
no
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