[Elecraft] [K3] Tone on 21.017

[tom_k1tl]

Hi Gang,

For some unknown reason, I have a tone around 21.017 on the K3. Don't know 
when it happened but just was on 15m (yea, the band finally opened to EU) 
and heard the tone. I thought that it was a "birdie" but it is "reverse" of 
signals on the band. This morning I had the tone again and went thru the 
filters and noticed that it stopped when it was above 2.2KHz. I have 6KHz, 
2.7KHz, 2.1KHz and 400Hz filters installed in the main. Only 2.7KHz in the 
sub and cannot hear it there.

Is it possible that I have a "bad" 2.1KHz filter??

HELP !

Tom/k1tl...