[Elecraft] P3 Noise band

[Bob McGraw K4TAX]

I noticed when working the 6M contest today, I observed a band of noise 
on my P3.   It always tracks above the frequency about 20kHz at the 
lower edge.   The width of the band of noise is about 35 kHz.   As I 
tune, the band of noise stays relative to the tuned frequency, thus 
moving up or down as I tune.    The amplitude of the band of noise is 
about 10 dB above the noise floor or about -125 db as shown on the P3.   
I've noted that it exists on both the yagi and the dummy load.

I've changed the input cable between the P3 and K3S, no change. When I 
disconnect the cable from the K3S the band of noise is not evident.  It 
doesn't cause me any issues, just noticed it.   Makes my go hummmm?

Any clues?

73

Bob, K4TAX