[Elecraft] Re: K3 S/N 412 annoying resonance

[Tim Heasman]

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" <abellve3xm at sympatico.ca>
To: <crc at cyberlink.bc.ca>
Cc: <elecraft at 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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