[Elecraft] K3 VFO By-product?

[Deane Walkington]

The image captured from my P3 shows an interesting issue for which I am
seeking an explanation.  On 28 MHz I am seeing a strong  "spike" (
harmonic?) which moves in conjunction with VFO A.  It is not absolutely
stable but does drift a little.   Unfortunately I cannot listen to the
"spike" which  is visible in all modes and does not affect normal operation
being well outside the filter bandwidth.  The image can be seen at    

http://hamradio.tumblr.com/

K3  Serial # 3940 has  TXCO3-1 fitted.  Filters are 13.0/2.7/400  .  Sub
receiver is not fitted.

Any ideas much appreciated an d a Happy New Year to all.

Deane
VK1DW