[Elecraft] K3s Odd sound vibrations Edit - Hypothesis, Steps, Conclusion, and Request.

[Jerry Moore]

That's exactly what I found. After speaking with Howard I've wedged the
ferrite with a bit of cardstock and the buzzing is gone where I listen. If I
change the spot frequency around I am able to find harmonic spots that make
the case buzz. Howard also gave permission via one of the other folks there
to put a dab of silicon on the ferrites to stop the rattle. 
Easy fix. The result seems to depend on where you like the monitor frequency
to be. 

I like Howard's suggestion to go with an external speaker or use a headset.
At this point it's fixed for my use.

Thanks.

Jerry Moore
CDXA, INDEXA, SKCC, Fists
AE4PB, K3S - S.N. 010324
http://www.qrz.com/db/AE4PB
An Amateur is - Considerate, Loyal, Progressive, Friendly, Balanced, and
Patriotic.


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Clay
Autery
Sent: Wednesday, February 17, 2016 1:48 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3s Odd sound vibrations Edit - Hypothesis, Steps,
Conclusion, and Request.

Another possible cause...  If you have the 100W PA option, you MIGHT be
hearing ferrite beads rattling inside the PA module.  I don't know why they
are loose on the wires, but they are and you can hear them rattle when you
shake the module prior to install.
The Assembly Manual references them and says the rattling is "normal".

IF they are the source of your buzzing, the module will need to be
disassembled and the ferrite beads fixed in some fashion so they don't move
and/or make contact with metal enclosure, shield, et al.

______________________
Clay Autery, KG5LKV
(318) 518-1389

On 2/17/2016 12:18 PM, Jerry Moore wrote:
> Final edits: sorry for the resend but I keep needing to update the 
> email as it's missing parts.
>
>  
>
> Hi, I thought I had the sound issue licked with the loose case screws 
> but I still hear the buzz. I believe I found the issue and it's NOT 
> the speaker (well I don't believe based on my findings).
>
>  
>
> Hypothesis:
>
> I strongly suspect loose transformer cores are the cause of the 
> buzzing that are especially louder at different harmonics.
>
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