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

[Clay Autery]

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.
>