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WJ-8718-19/FE HF RECEIVER
MAINTENANCE
5.
Set up the Sweep Generator as follows:
a .
Power
ON
b.
CW/Sweep
SYM
c .
Trig/Line/Free
Line
d.
Fast/Slow/Manual -
Fast
e .
Crystal Cal
OFF
f.
Range
11
g.
Sym Sweep Width -
Vernier
.1/1
h.
1 kHz Mod
OFF
i.
Output Level
-10 dBm
J.
Frequency
455 kHz
6.
Set up the Marker Generator for a 455 kHz output,
unmodulated, at -25 dBm.
7.
Set the receiver controls as follows:
a.
Meter
-
N/A
b.
Gain Mode
-
N/A
c .
Detection Mode
-
FM
d.
RF Gain
-
N/A
e.
Phone Level
-
N/A
f.
IF Bandwidth
-
N/A
g-
Receiver Frequency
N/A
h.
BFO offset
-
N/A
8.
Energize
the
receiver.
Adjust
Sweep
Generator
Frequency control to center the response pattern on the
Oscilloscope screen.
9.
Adjust
A4A9L1 and A4A9T1
for
an
Oscilloscope
waveform
which
has
maximum
amplitude
and
is
symmetrical and linear about the marker.
See Figure
4-8 for a typical waveform.
10.
Deenergize the receiver.
11.
Disconnect the test equipment and install A4A7, A4A9,
and A4A10 boards into the proper slots.
4-71
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