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19. Second Converter Adjustments
19. Second
Converter
Adjustments
Reference
RF Section:
A23
RF Converter
Related Performance
RF Gain Uncertainty Test
Test
Spurious Responses Test
Description
First, the second LO frequency is adjusted for proper frequency and
then the LO shift is adjusted by using the front-panel keys to shift the
LO up and down. Next, the Pilot IF Bandpass Filter is adjusted for
proper
bandpass
and amplitude, then the signal IF Bandpass Filter
is adjusted. The second LO frequency and shift are checked and
readjusted, if necessary.
SYNTHESIZED WEEPER
20
dB
ATTENUATOR
R
POWER METER
PDWER
SENSOR
Figure 3-72. Second Converter Adjustments Setup
Equipment
Frequency Counter
............................
HP
5340A
Scalar Network Analyzer
.......................
HP
8757A
Synthesized Sweeper
........................
HP
8340A/B
Amplifier
......................................
HP 8447F
Power Splitter
......................
HP
11667A
Opt. 001
Power Meter
.................................
..HP436
A
Power Sensor
................................
..HP8482
A
Detector
(2
required)
........................
HP
11664A
Adjustments 3-123