[Elecraft] Spurious signals heard -- K2

[Vic Rosenthal]

W3FPR - Don Wilhelm wrote:

> Vic,
> 
> OK, I will venture a guess ---
> 
> You might want to check for a large signal in the shack from 11.5 to 
> 11.7 MHz - like in a computer for instance, oscillators near 12 MHz are 
> common in computers, and the frequency may depend on what is going on 
> inside the computer.

I didn't believe you, because the signal is there with no antenna.  But I 
decided to check some things.  When I turned of the shack computer, the spur 
didn't disappear...but it got weaker!  Hmm, what could that mean?  I then 
disconnected the interface cable from the K2 which goes to the KAT100, the KRC2, 
and the computer (I like gadgets).  It disappeared!  AHA!  Now I reconnected it 
and tried disconnecting just the KRC2 -- bingo, all gone.  The oscillator in the 
KRC2 must be sending a strong signal into the K2 via the interface cable.

By the way, I did do the 17 meter EU BC mod some time ago because I had a 
similar problem due to large SWBC signals.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco