snip
> When the "cw" button is pushed you get a sidetone. While holding down
>this button you move your dial until your target's tone is "beating"
>against your sidetone. When you move the dial enough so that your sidetone
>no longer "beats" and the tones are "insync" they become "one". When two
>tones become "one" the tone gets louder. This is "zero beat". Even having
>just "beating" is close enough for govt work.
snip
For many years I have been under the impression that "zero beating" was the
method of beating (hetrodyning) of two frequencies bringing their difference
down to the audible range and adjusting one to match the frequency of the
other so that the two tones beat against each other producing "zero" out.
Thus the term zero beat. Not a louder tone.
de wd4air
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