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

[Eric Swartz - WA6HHQ, Elecraft]

Make sure you use non-acidic silicon glue that is compatible with PC boards to 
do this.

Other types can degrade traces etc on the board.

Eric
/elecraft.com/

On 2/17/2016 11:05 AM, Jerry Moore wrote:
> 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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