[Elecraft] K2 & KPA100

[Ron D'Eau Claire]

From: "Joe Randle" <randle@fwi.com>
To: "Elecraft Reflector" <elecraft@mailman.qth.net>

> 2.  Thanks for the explanation on zero-beating. I still can't seem to hear
that "third" tone that is the difference between the cw signal pitch and the
sidetone pitch.

Yeah. Back in the "old days" the other two tones were at the intermediate
frequency, so we only heard the single heterodyne note in the audio and we
tuned until it went to zero.

Practice using WWV at 10 MHz. It's easier to hear it on a steady tone, and
once you know what it sounds like, your ear will pick it up on CW very
easily. In CW mode, turn on SPOT, and tune slowly so the tone goes from a
high pitch toward a low one. Keep the level of the SPOT tone near the same
as the signal level. As you approach "zero" you will hear the low frequency
tone mixed in that goes toward zero.

Tom, N0SS, collected some good samples of what this sounds like. Look up the
Elecraft WEB site at www.elecraft.com , go to the Builder's Resources and
click on "Zero Beating a Signal on the K2 (or K1)"

Ron AC7AC
K2 # 1289