[Elecraft] K3: KPA100 Squeal

[Bill W4ZV]

AB3LS wrote:
> 
> No go.
> 
> Hooked the radio up to a gel cel battery and we're still getting the 12Khz
> junk coming from something and the clicking between TX and RX.
> 
> I made a longer recording of the 'junk' and posted it. Cycled between TX
> and
> RX a few times using the manual TX button on the front. Then finished off
> with a few dits and dahs. All while in TX Test mode.
> 
> http://alien.liltechdude.com/files/index.php?dir=Recordings/&file=kpa3squealrev2.mp3
> 
> Anyone from Elecraft have anything on this?
> 

FYI I noticed the same on my #4717 kit (delivered last September).  I
normally use headphones so I never noticed it before.  I believe ~12 kHz was
getting into the DSP chain before the LPF mod to the DSP board was done so
perhaps that's a clue.  BTW I have no switching PS anywhere and this is
definitely coming from the K3 itself.

This would be VERY annoying to someone with good hearing in a quiet shack. 
I can minimize it by slight head movement (standing waves) but that's not a
good solution.

73,  Bill


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