[Elecraft] K2 CW sidetone

[Ken Lotts]

Regarding headphones,

I can't report that I know of low fi headphones (since I already have lo fi
ears) but I can report about a headphone set that truly "feels good" after
**hours** of use and they are available just about everywhere.

JVC Noise Canceling Stereo Headphones HA-NC100.
http://img502.imageshack.us/img502/8522/dsc000101ko.jpg

Comfort after hours of use is what amazes me but the bonus is:

 - they are reasonably inexpensive.
 - they are noise canceling (uses a single AAA)
 - the cord retracts! (wow)
 - they are light weight and fold up for travel

Mine are a few years old now and they have not self destructed in the
slightest so they appear to be reasonably durable even though they are just
plastic and the cord is thin.


Ken Lotts
aa7jc




-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of kt5x at cybermesa.com
Sent: Friday, November 10, 2006 7:18 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] K2 CW sidetone


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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