[Elecraft] K3 3051 audio buzz in chassis on SSB

[Tom-N2YTF]

Craig,

Any chance you could post or email me a few pictures? Also, what transformer
did you use to replace the stock one?

Thanks!

Tom-N2YTF
email is n2ytf at the standard arrl email address.





Craig-89 wrote:
> 
> 
> Hi Paul
> 
> I had a similar problem which drove me nuts.
> 
> I pulled the K3 apart to try and find this problem and  tightening every
> screw in the 
> re-assembly process. The  problem persisted however. This  buzz was
> following my SSB 
> modulation  with perfect timing.
> 
> I used a stethoscope and found that the buzz was  coming from a small area
> where the
> SWR/power meter directional coupler was situated. The problem turned out
> to be one of 
> the directional couplers transformers which was arcing to the ferrite
> core. 
> 
> At first sight the transformer looked perfect, however I could clearly
> hear the buzz in the 
> stethoscope. I replaced the ferrite transformer and the buzz went away.
> When I examined  
> this   transformer,  the arcing signs were very obvious under the enamel
> wire facing the 
> core.
> 
> The directional coupler transformers are very small and its a tricky job
> getting it  back in 
> place. Ideally this transformer should have better insulation, however
> there is not much 
> room on the  core for extra insulation. 
> 
> 
> 73
> Craig
> 
> 
>       
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