[Elecraft] K2 & KPA100

[Vic Rosenthal]

Joe Randle wrote:

>  I still can't seem to hear that "third" tone that is the difference between the cw signal pitch and the sidetone pitch. 
...
> I believe I could match the received pitch with the sidetone pitch. I just can't hear the "whoosh, whoosh, whoosh" or whatever it is you are supposed to hear!  Help!

One thing that helps is the sine-wave sidetone modification which can be found
on the Elecraft web site at 

http://www.elecraft.com/Apps/sinewave_sidetone_mod.htm 

When you get two sinewave tones close together in pitch you start hearing a
buzzing at their difference frequency.  When you get within 10 Hz or so, it
becomes a 'thrumming' -- it sounds like a single tone whose loudness varies at
the beat frequency.  The unmodified K2 sidetone makes this a bit harder to hear
because it has an inherent buzziness.

Vic K2VCO