Hi Steve:
Sometime between s/ns 2888 and 3442 that I built, there was a mod to the
sidetone circuit that added on the control board an inductor (now L1
82mH) and a resistor (R11 47K) to "round off" the square wave. I do not
know if that was included in the major mod to bring up pre 3000s to the
latest mods. I think it is called the K2ATOBKT. I do NOT recall any
complaints specifically like the 2nd harmonic problem when set at 400 Hz.
73,
Ken Wagner K3IU
Steve Kallal wrote:
I have a K2, serial #2289, that has a second harmonic in the sidetone. The
sidetone is set for 400 Hz because I do much better with lower pitches. The
sidetone at 400 Hz has a definite square wave sound to it. The problem
certainly is not present at 600 Hz, and I don't even want to try 500 Hz. I'd
go lower than 400 Hz if the K2 allowed it.
I talked to Don Wilhelm about this and he seemed puzzled. There is a post
off of the Elecraft web site about this at
http://www.qsl.net/ve3mcf/elecraft_reflect/K2_Sinewave_Sidetone.txt. But
that thread is dated Winter 2000. I would think the K2 has gone through
enough evolutions to correct this. Perhaps not?
Has anyone had this problem and corrected it? The sidetone is useable but
annoying. It also makes zero beating a signal a lot harder.
73,
Steve N6VL
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