1. While speaking into the microphone, turn the VOX SENS control to just beyond a setting
that will energize the relays. Be sure this control is not set so high that it will allow
background noise to trip the relays.
2. Tune the receiver to a fairly strong signal and adjust the AF GAIN control for a comfortable
listening level.
3. Place the microphone where it will normally be used. Advance the ANTI-TRIP gain control to
Just beyond a setting that will keep the speaker signal from tripping the VOX circuits. Be
sure this control is not set so high that it completely disables the relay closing action.
4. Speak into the microphone and turn the VOX DELAY control to a setting that will hold the
relays energized during the slight pauses between words. This prevents the relays from
tripping at the beginning and end of each word.
NOTE: There will be a slight interaction between the VOX SENS, ANTI-TRIP, and VOX
DELAY controls. Consequently, it may be necessary to readjust these controls to
achieve the desired results.
The Transceiver is now ready for operation in the SSB mode. Speaking into the
microphone (VOX) or using the microphone push-to-talk switch (PTT) will change the
Transceiver from receive to transmit operation.
d.3. CW Operation
For CW operation, the FUNCTION switch can be set to either the PTT or VOX
positions. Even though CW operation is possible in the Calibrate position, it is not
recommended because of possible spurious outputs from calibrator signals being
present at the grid of the driver stage.
For 400 Hz CW selectivity, the Heath SBA-301-2 CW crystal filter may be installed in
addition to the SSB crystal filter supplied with the Transceiver. The filter switch will then
select the SSB or the CW filter.
Be sure steps 1 through 10 have been satisfactorily completed before proceeding with
the following adjustments.
1. Place the MODE switch in the CW position.
2. Plug a key into the CW KEY jack.
3. While sending a series of "V's", adjust the VOX DELAY control so the relays stay energized
between groups of characters. Clockwise rotation of this control will increase the holding
time of the relays. The final setting of the VOX DELAY control will be determined by the
sending speed of the operator. The slower the sending speed, the higher the setting of this
control.
Transmit Tuning and Operation revised 12/17/2021 Page 30
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