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16. Second IF
Amplifier and
Third Converter
Adjustment
Reference
RF Section:
A19
Second IF Amplifier
A20
Third Converter
Description
A synthesized sweeper is used to inject a signal of 301.4 MHz at -20
dBm in to the
A19
Second IF Amplifier. The output of the amplifier is
displayed on a scalar network analyzer. The amplifier is adjusted for
a
bandpass
of greater than 7 MHz and less than 14 MHz centered at
301.4 MHz. Its gain should be greater than 14
dB
and less than 17
dB.
A spectrum analyzer is used to view the output of the 280 MHz
Oscillator on the
A20
Third Converter and the oscillator is centered in
its adjustment range.
SYNTHESIZED WEEPER
SPECTRLM
ANALYZE
PCYhER
METER
20
dB
ATTENUATOR
NETWORK ANALYZER
SPECTRUM ANALYZER
(Dovisa
Under
Tut)
Figure 3-63. Second IF Amplifier Adjustments Setup
Equipment
Spectrum Analyzer
.........................
HP
8566A/B
Synthesized Sweeper
........................
HP
8340A/B
Scalar Network analyzer
.......................
HP
8757A
Power Splitter
......................
HP
11667A
Opt. 001
PowerMeter
.................................
..HP436
A
Power Sensor
..................................
HP
8482A
Detector (2 required)
.........................
HP
11664A
20
dB
Attenuator
....................
HP
8491A,
Opt. 020
3-112
Adjustments