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ter is required.
The following procedure is
recommended.
(1) Connect output from an R. F. Sig
nal Generator through a small coupling capac
to Test Point jack TP205 which is at the grid
of the 2nd Mixer V213.
(2) Connect output from an Audio
Oscillator to terminal 12 on TB102 in the
Power Supply. Adjust the frequency of the
Oscillator to 1800 cps when a Type F-250Z-4
filter is used or to 1950 cps when a Type
MFU-250-1 filter is used.
(3) Set filter tuning capacitors C314
and C315 to approximately mid-position.
Set
the RECEIVER GAIN to 0 and energize the
receiver.
(4) Adjust the Audio Oscillator out
put to give a fairly low audio volume in the
receiver loudspeaker.
(5)
Adjust the Signal Generator fre
quency to just above 250 kc (approximately
251.
8
kc, if calibrated). Increase RECEIVER
GAIN and/ or Signal Generator output until an
audio beat is heard in the speaker.
Vary
Signal Generator frequency slightly if no beat
37
is hear at first.
(6)
Adjust output of Signal Generator
and Audio Oscillator to give approximately
the same level in the speaker.
(7) Vary Signal Generator frequency
to zero beat with Audio Oscillator in speaker.
(8) Remove Audio Oscillator and
proceed with tuning the filter.
NOTE: If equipment for the above is not
available in the field, a temporary adjustment
may be made by setting the receiver up on a
regular channel but with no signal present,
RECEIVER GAINat maximum and then tuning
for maximum noise in the speaker. (Perma
nent adjustment should be made at the earli
est opportunity using proper frequency).
(9) Tune capacitor C315 and then
C31.4 for maximum response in the speaker,
using RECEIVER GAIN control to cut volume
to a resonable value for listening.
Use an
insulated screwdriver for all tuning adjust
ments.
(10) Shut down receiver and remove
Signal Gene rat or connections.
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