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Second Converter
Final Adjustments
53. Repeat steps 14 through 19 to ensure that Second LO frequency
and shift are still properly adjusted.
54. Check the bandpass at the 3 dB points for both the 2ND LO T
and 1. On the scalar network analyzer, press [%i?%@ Max. Press
cursor A a and set the cursor at the -3 dB point 50.1 dB. Press
cursor A, cursor A, and set the cursor to the corresponding -3 dB
point on the opposite side of the signal. The cursor should now
read 0 kO.1 dB.
55. On the synthesized sweeper, press Ihns) and place the marker on
either cursor A. Press (M4), and place the marker on the cursor A
on the opposite side of the trace.
56. On the synthesized sweeper, press [MKRn), and read the bandpass
Figure 3-74 and Figure 3-75.
57. Disconnect all test equipment from HP 8568B Spectrum Analyzer
and reconnect all cables within the instrument: cable 80
(gray/black) between A23A3J6 and A9J1, and cable 92 (white/red)
between A23A3J5 and A19Jl.
58. Connect HP 8568B Spectrum Analyzer CAL OUTPUT to SIGNAL
INPUT 2. Key in
(
CENTER FREQUENCY
MHz,
(
REFERENCE
59. Key in
signal amplitude as indicated by marker level CRT annotation.
60. Continue to key in ISHIFT) @) u then (SHIFT) (IJ T while adjusting
states of the Second LO 3x0.1 dB.
61. Reinstall RF Converter in instrument. See installation procedure
in RF Section of Troubleshooting and Repair Manual, Volume 1.
19. Second Converter Adjustments
20 MHz,
)
-7 dBm, SCALE LOG
[
Key in m @ T and note
]
PEAK SEARCH
1
(
)
FREQUENCY SPAN
1 dB,
ENTER
Adjustments 3-129
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