[Elecraft] K2 CW sidetone

kt5x at cybermesa.com kt5x at cybermesa.com
Fri Nov 10 09:18:05 EST 2006


First, thank you for various responses (I get the digest so I don't see 
responses until next day).

Yes, my K2 is older, serial # 700.  Yes, it began life as an awful tone.  I 
did Randy's mods, but early ones.  

*  It turns out that I have a 47 mh inductor, and I have ordered the now 
preferred 87 mh inductor, hopefully that will help.

*  I found Randy's original instructions from which I worked, and note that 
it is said to distort at sidetone frequncies below 530 cycles, and indeed, I 
had changed to 500 cycles, so that is part of it.  It is recommended that I 
change C33 to 4.7 uf to reduce or eliminate low frequency distortion.

*  I also find the headfone in use has a LOT to do with how it sounds.  Wide 
response headofnes sound terrible.  Has anyone found sensitive headfones with 
more limited (not hi-fidelity) low impedance phones that do especially well 
with the K2???

72, Fred kt5x / w5ya


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