Set the rear apron VOX controls as follows:
VOX-SE NSITIVITY
.... ....
. .
.
. .
.
.
.
. .fully cw (max. sensitivity)
VOX- THRESHOLD .
.
.
. . .
•
. . . . .
. fully cw (guaranteed to return to receive)
VOX-DE LAY.
. . . . ..
•
. . ..
.
. . . .
. fully ccw (minimu m delay)
ANTI- VOX.
.
. . .
.
. . .
.
. . .
.. .
. . . .fully cw (maximu m anti-vox)
Repetitively speak a few syllables into the microphone to trigger the VOX to "on" as often as
necessary, while adjusting the VOX-DELA Y control until the desired release time af ter speaking is
obtained.
Now, turn the VOX-SE NSITIVITY control ccw to a point where the relay trips easily while speak-
ing into the microphone at nor mal level and distance, yet does not trip on nor mal background noise.
In a mobile installation, this adjustment should be made for "close-talking", in order that the nor mal
automobile and wind noises not cause the VOX to trigger.
Next, place the microphone in its normal position of use, and set the A F GAIN control for a
nor mal listening level from the speaker as nor mally located. Then turn the ANTI- VOX control ccw
(reducing ANTI-VOX gain) as far as it may go without per mitting the VOX to be triggered to "on" by
the sound from the speaker r eaching the microphone. From this point, back off cw about 30 degrees
of rotation to insure adequate anti-vox gain to handle voice peaks.
Now reset VOX-THRESHOLD to fully ccw position. Trigger the VOX to "on" by speaking one or
two syllables into the microphone, and then turn the VOX-THRESHOLD control cw until the r elay re-
leases. As there may be some "chatter" at this critical point of the VOX- THRESHOLD control, turn
it just slightly further cw than the critical point.
While holding the relay in the transmit condition by speaking steadily into the microphone, adjust
the MIC GAIN control exactly as described in step 1above. In a mobile installation, make this adjust-
ment for "close-talking", in order that the nor mal automobile noises not cause the VOX to trigger.
3. The transceiver is now tuned and ready to operate. Re-adjust EXCITER TUNE and PA TUNE
if
the operating frequency is shifted substantially.
MAIN TUNING CONTROL
The MAIN TUNING control has a unique dual ratio ball drive, per mitting both 6: 1rapid tuning and
30: 1 fine tuning. Fine tuning over 10 degrees of scale is obtained in the opposite direction of knob
rotation used in rapid tuning. For this reason, tur n slightly past the desired frequency in rapid tuning
to assure that the exact desir ed tuning
f
requency will be in the range of the fine tuning.
RECEIVE R OFFSE T TUNING
Permits fine tuning of the receiver ± lOkc without disturbing the transmitting frequency or the
initial calibration of the frequency dial. No offset from the transmitting frequency (and the frequency
dial setting) is obtained with the REC EIVER OFFSE T control set at the center line. Rotation cw from
the center line lowers the receiving frequency, while ccw rotation from the center line raises the
receiving frequency.
CW OPERATION
1.
It
is assumed that the r ear apron BIAS adjust has been set as descr ibed in TRANSMITTE R
TUNE -UP FOR SSB OPE RATION. For break- in operation,
it
is also assu med that all VOX adjust-
ments at the rear have been set as described in the note of step 2 of MIC ROPHONE GAIN ADJUST-
ME NT.
2. Insert key plug in KEY jack on rear apron.
6
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