
20. Last Converter Adjustments
20.
Last
Converter
Adjustments
Reference
Description
Equipment
Procedure
RF-Section:
A6A3
Last Converter
A 321.4 MHz signal from a synthesized sweeper is applied to the 321.4
MHz IF input of the
A6A3
Last Converter Assembly, and the 321.4
MHz Bandpass Filter is adjusted. Then, a 310.7 MHz signal is applied
to the 321.4 MHz IF input, and the 10.7 MHz Notch Filter is adjusted
to null 10.7 MHz subharmonic spurious responses.
Synthesized Sweeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP
8340A/B
Spectrum Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8566B
15x2 Extender Board (service accessorgj . . . . . . . . . . . . .
.08505-60041
Probe (SMB Male Bulkhead Connector) . . . . . . . . . . . . . . . . . . .1250-0691
Cables:
BNC to SMB Cable (2
required)
(semice
accessow)
. . . . . 85680-60093
1. Set the spectrum analyzer LINE switch to STANDBY. Turn the
spectrum analyzer over to position the RF Section on top, as
shown in Figure 3-87, and remove the RF Section bottom cover.
2. In the RF Section, disconnect cable 84 (gray/yellow) from
A6A12Jl
and cable 82 (gray/red) from
A6A12J2.
Disconnect
cable 2 (red) from A6A9Jl 300 MHz OUTPUT, cable 0 (black) from
A6A9J2 CAL OUTPUT, cable 85 (gray/green) from
A6A9J3
100
MHz INPUT, cable 4 (yellow) from A6A9J4 VCO TUNE, and cable
5 (green) from
A6A9J5
3.3
GHz
INPUT.
3. Remove the cover from the A6 RF Module. Remove the
A6A9
Phase Lock Assembly, the
A6AlO
Miscellaneous Bias/Relay Driver
Assembly, the
A6All
Slope Generator Assembly, and the
A6A12
YTX Driver Assembly from the RF Section.
Adjustments
3-l
69
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