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" <[EMAIL PROTECTED]>
To: "Richard S. Lindzen" <[EMAIL PROTECTED]>
Cc: <elecraft@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
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