[Elecraft] K3 RF Feedback Problem

[Igor Sokolov]

I have just received my K3 factory built and been playing with it for the 
last two days. I immediately discovered RF feedback problem which was cured 
by connecting pin 7 of the mike plug to the shell of the  connector. I do 
plan to use rear mike and audio connectors  as well but I am getting a bit 
confused with what exactly needs to be modified to avoid RF feedback. I would 
really like to get inside  only once. May be Elecraft can officially issue 
recommendations for the mod regarding this RF feedback issue. Hopefully the 
one that would require minimum surgery on the radio.

73, Igor UA9CDC


>> L5 - Line In (J21);
>> L3- Line Out (J22);
>
> These are transformer isolated and not returned to frame or chassis ground 
> specifically to avoid ground loop problems.  The inductors are there to 
> help keep RF out.  These "commons" are notational - they are not common 
> with anything.
>
> 73,
>
> Lyle KK7P
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com