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MAINTENANCE
WJ-8718-19/FE HF RECEIVER
7.
Energize
the
receiver.
Adjust
Sweep Generator
Frequency control to center the response pattern on the
Oscilloscope screen.
8.
Adjust
A4A7L2
and
A4A7L3
for
an
Oscilloscope
waveform
which
has
maximum
amplitude and
is
symmetrical about the marker.
See Figure 4-5 for a
typical waveform.
9.
Deenergize the receiver and disconnect test equipment.
10.
Install A4A3 and A4A10 cards in the proper card slots.
SIGNAL
GENERATOR
RF
OUT
O
HF RECEIVER
A4A7-57
A4A7-3I
O
O
OSCILLOSCOPE
VERT
H0RI2
IN
IN
O
O
o
#o
o*
arrc;
2:1
SUMMER
a
a
SWEEP
GENERATOR
SWEEP OUT
OUT
RF
(3
ci
5
Figure 4-4. 455 kHz Amplifier/AM Detector Response Alignment, Test Setup
4-68
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