[Elecraft] K2: Slight crackle with SSB tx with KPA100

[David Walker]

Hi folks,

I'm just doing some fine tuning with my K2 after a few years of use.  I 
now have a second receiver so I can listen to my audio and fine tune 
those filters for SSB tx. 

I notice a slight crackling appears in my SSB transmission when at the 
point the KPA100 starts operating.  It does not get worse when the power 
is increased - so I am sure it's not RF feedback.  Happens on all 
bands.  When I am below the 11w level and the KPA is inactive the SSB 
audio loses the crackle around the edges.

Any ideas?  Do other people have this?

Regards,

Dave