[Elecraft] K3: cw xmiting 2 signals 600hz apart: HELP

[DOUGLAS ZWIEBEL]

Hi everybody...

I local K3 owner received this memo and forwarded it to me this
morning for my opinion:

<When you were working HA5JI, you had a side band about s6 up about
600 Hz.  I did not check the down side. Your main signal was s9+20.>

I was at work so I said I would listen when I got home (we live about
3 miles apart).

On 160m (where he got the notice), his signal sounded fine barefoot,
but with the amp on, I could hear it also.  So I asked him to qsy to
40m where he is about 25db over 9 on my K3.  And as I tuned off of
him, I could hear the "second signal" as described above.  The 2nd
signal tunes in the same direction as the real signal (it is not blow
by).

Any comments or even better, any suggestions for him?

Thanks,
Doug KR2Q