in cw model, the zero beat button defeats the RIT(offset
tuning) and the 750 hz built-in offset - so you hear zero
beat.
When you release the button, the signal is peaked for the 750
hz transmit shift and audio filter passband. Would suggest
tuning and zero beating with RIT turned off - hear a signal,
press button, go to zero beat, release button - then use offset
as needed.
Vox gain - is like microphone gain, adjusts amount of sound
needed to turn rig to transmit -
call TenTec service, buy a manual - the rig is fun, very good
keying and very good receiver -
Dave K8BBM
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