[Elecraft] K3 spurs

[Bill Stravinsky]

 If you have an older K3 there was a problem with them generating a spur.  I had the problem when a friend reported hearing me on a 2nd freq.I'm guessing nobody still has an older K3 though with this problem.
We have determined that a small number of K3/100s and KPA3s left the factory earlier this year (2009) with capacitor C3 installed by mistake on early Revision C KPA3 PC boards.  This part location should be empty on Rev. C KPA3s.  Installation of C3 causes the PA bias supply to oscillate on some KPA3s at approximately 15-20 kHz, resulting in spurious TX sidebands at that spacing from the carrier.
Info is on the Mods & Notes page almost at the bottom.  
http://www.elecraft.com/K3/k3_app_notes.htm
BillK3WJV


    On Tuesday, May 15, 2018, 9:30:41 AM EDT, Roger D Johnson <n1rj at roadrunner.com> wrote:  
 
 I was watching 6m yesterday and noticed several spurs. They were spaced 39kHz
apart. Amplitude dropped but didn't disappear when switched to dummy load.

I have the K3 with new synthesizer boards. Just wondering if anyone else seeing
something similar. IOW is it something in the K3 or external?

73, Roger

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