[Elecraft] RF feedback

[Richard S. Lindzen]

Dave,

Many thanks.  With all the suggestions, I hesitated to pull off the 
front panel, but I did quickly try your approach, and it appears to 
solve the problem.  Apparently the "pin 1 problem" struck again.

Dick, KA1SA

At 08:57 PM 12/5/2008, Dave Hachadorian wrote:

>----- Original Message ----- From: "Vic K2VCO" <vic at rakefet.com>
>To: "Richard S. Lindzen" <rlindzen at MIT.EDU>
>Cc: <elecraft at mailman.qth.net>
>Sent: Friday, December 05, 2008 6:10 PM
>Subject: Re: [Elecraft] RF feedback
>
>
>>There is a so-called "pin 1 problem" in the K3's mic input 
>>circuitry. The fix is to jumper L4 on the front panel board and L7 
>>on the KIO3. These are RF chokes in the mic return lines.
>------------------------------
>
>I just did these mods today, along with the audio upgrade mods. I 
>was too lazy to pull off the front panel to get to L4, so I just 
>jumpered pin 8 on the mic plug (not the jack on the K3) to the metal 
>shell of the plug.
>
>Dave Hachadorian, K6LL
>Yuma, AZ
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Dick Lindzen, KA1SA
301 Lake Avenue
Newton, MA 02461 USA

1-617-332-4342