14. 100 MHz VCXO Adjustments
output signal. Verify that the 100 MHz harmonics do not exceed
the levels listed in
3-8
3-8. Limits for 100 MHz Harmonics
20. Set the controls of the second spectrum analyzer as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 Hz
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 dB/div
21. Slightly readjust the
and
400 MHz
adjustments in sequence to maximize the power level of the 400
MHz output signal, and then verify that the maximized power
level of the 400 MHz output signal is -10
If it is not,
note
the
amplitude and change
the
values of attenuator network
resistors
and
as necessary.
3-9 contains a list of attenuations in
steps and the
corresponding
values for the attenuator resistors to adjust the 400 MHz
output power level to -10
Refer to Table 3-10 for HP
part numbers, and to Figure 3-65 for the location of
and
3-9.
Selection Chart for Attenuator Resistors
Resistors
Attenuation
0
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
R67
open
825
422
261
215
178
147
133
121
110
R68
short
6.8
12.1
17.8
23.7
31.6
38.3
46.4
51.1
61.9
R69
open
825
422
261
215
178
147
133
121
110
Adjustments
