Hi All,
I did an experiment with my K3 this afternoon, and found the top cover
resonating at about 400 Hz, but I had to turn the AF gain to full to get it
really going. With the gain at < half I could not really notice it.
The front edge of the top cover was vibrating against the front panel frame.
Perhaps another couple of screws along that edge might be a fix. I suppose
that might increase the resonant frequency of that edge out of the side tone
pitch range.
Tim
gm4lmh
----- Original Message -----
From: "Robert C.Abell" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: <elecraft@mailman.qth.net>
Sent: Monday, August 11, 2008 5:12 PM
Subject: [Elecraft] Re: K3 S/N 412 annoying resonance
Hi Fern,
Please excuse my previous e-mail.
Your annoying speaker resonance may be due to over tightning the speaker
mounting screws and having distorted the speaker frame to cause it to
contact the voice coil. Try loosening the screws somewhat.
I have K3/100 S/N 409 and do not have this problem but I have built several
K2's and was aware what to look out for over the years with the supplied
speaker.
Let me know what you find.
73, Bob VE3XM
Wellesley, ON
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