[Elecraft] K3S speaker vibration/whine

[Randy Moore]

True, Ron, but there are several inches of metal between the screws.

Randy
On Oct 22, 2015 11:43 AM, "Ron D'Eau Claire" <ron at cobi.biz> wrote:

> Are all the top screws in place, including the chassis stiffener bar that
> is mounted on the KPA3 shield and attaches to the top with three screws?
>
> When assembled, there are no "vertical metal pieces that contact the top"
> that are not secured by screws.
>
> 73, Ron AC7AC
>
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
> ae4pb at carolinaheli.com
> Sent: Thursday, October 22, 2015 8:56 AM
> To: 'Randy Moore'; ae4pb at carolinaheli.com
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3S speaker vibration/whine
>
> Outstanding!! I’ll try that. I don’t listen to my rig often over the
> speaker as I have some different hearing losses in each ear.
>
> <snip>
>
> Jerry,
>
> I have this buzzing in my K3, and have heard it in some (not all) of the
> K3s I have built for friends. I have found that most of it comes from
> vibration between the case top and the vertical metal pieces that contact
> the top. If that's what you're hearing, you can minimize it by putting some
> vinyl tape over the tops of the metal pieces.  In each case I've seen,  the
> buzzing is worst around 400 Hz, near my favored CW sidetone frequency!
>
> 73,
>
> Randy, KS4L
>
> </snip>
>
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