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Equipment
Cable, SMA (m) to SMA (m) . . . . . . . . . . . . . . . HP 85680-20094
Procedure 1.
Set instrument LINE switch to ON and press
2.
Connect CAL OUTPUT to SIGNAL INPUT 2.
3.
Key in
4.
Adjust front-panel AMPTD CAL for signal peak at top graticule
line (-10 dBm).
5.
Press
6.
Key in [SHIFT) [RUN) ". This disables phase lock flags.
7.
Position instrument on right side and remove bottom cover.
8.
Disconnect cables from A23A5J2 (PILOT IF OUT) and A23A3Jl
male connectors ( do not use adapters) between A23A5J2 and
available, remove A23FL2 FILTER and use between A23A5J2 and
9.
Key in
left of CRT display to indicate START 40 MHz.
10.
Key in (mFRE9) 1560 MHz. Wait for CRT annotation at lower
right of CRT display to indicate STOP 1560 MHz.
11.
Key in
(
ENTER
12.
Adjust Al6 COMB DRIVE A16R31 for peak amplitude of CRT
trace until comb teeth begin to "wiggle." Then adjust COMB
DRIVE A16R31 slightly counterclockwise until the lowest comb
tooth (near START frequency) just begins to fall. See Figure 3-84
for a typical comb tooth display. See Figure 3-83 for location of
adjustments.
13.
Adjust COMB BIAS A23A4A2R6 for peak amplitude of CRT trace
until comb teeth begin to "wiggle. " Then adjust COMB BIAS
(near START) frequency) just begins to fall. See Figure 3-84 for
22. Comb Generator Adjustments
20 MHz,
)
FREQUENCY
0 dB, LOG
[
ENTER
40 MHz. Wait for CRT annotation at lower
(
START
-20 dBm, (ATTEN] 0 dB, LOG
[
]
REFERENCE LEVEL
U P P E R L I M I T
D I S P L A Y L I N E
A T - 3 0 dBm
L O W E R L I M I T
- 3 6
Figure 3-84. Comb Teeth Display
PRESET
100 kHz,
[
]
FREQUENCY SPAN
2 dB.
Adjustments 3-137
).
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