[Elecraft] K1 sidetone overpowers headphones

[Dave Gingrich K9DC]

On Sunday, May 4, 2003, at 09:04 EST, Robert J Greenwalt Jr wrote:

> Don't know if this is an unusual situation or not -- My K1 works fine 
> on
> speaker but when I plug in a set of Bose noise cancelling phones the
> sidetone during keying becomes an overwhelmingly loud crashing tone in 
> the
> phones.  Its almost painfully loud.  When I set the K1 output to zero 
> the
> keyer sounds fine in the headphones.  When I turn the power back up to
> actually transmit, I get the crashing effect.  Reducing the StL level 
> has no
> effect.  The Bose phones have an audio amplifier in the line to 
> produce the
> noise cancelling effect -- could RF be causing this?

Probably yes. I also have the same Bose headphones. Totally useless 
anywhere near anything resembling RF.

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Dave Gingrich, K9DC
Indianapolis, Indiana USA
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