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[K3] Speaker buzz

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Randy Moore

[K3] Speaker buzz

Just completed my third K3/100 build (this one is actually mine!), and
like the other 2, this one had a speaker buzz (not heard through
headphones) at audio frequencies around 300 hz on CW, but this one
seemed worse. I fixed it by:

1. Lining the lip and inside of the speaker shield with one layer of 3M
electrical tape. This removed ~80% of the buzz.
2. Putting a 1" long piece of same tape over the middle of the top edge
of both sides of the KPA3 module shield. This put tape between the top
edge of the shield and the top cover of the K3. This removed the
remainder of the buzz, and I now have clean CW tones through the speaker!

73,
Randy, KS4L
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The Smiths

Re: [K3] Speaker buzz

Didn't you get the little foam doughnut that sticks to the back side of the speaker? This is there to do exactly what you are describing. If not, you should order one from Elecraft.

> Date: Sat, 14 Aug 2010 10:44:54 -0500
> From: [hidden email]
> To: [hidden email]
> Subject: [Elecraft] [K3] Speaker buzz
>
> Just completed my third K3/100 build (this one is actually mine!), and
> like the other 2, this one had a speaker buzz (not heard through
> headphones) at audio frequencies around 300 hz on CW, but this one
> seemed worse. I fixed it by:
>
> 1. Lining the lip and inside of the speaker shield with one layer of 3M
> electrical tape. This removed ~80% of the buzz.
> 2. Putting a 1" long piece of same tape over the middle of the top edge
> of both sides of the KPA3 module shield. This put tape between the top
> edge of the shield and the top cover of the K3. This removed the
> remainder of the buzz, and I now have clean CW tones through the speaker!
>
> 73,
> Randy, KS4L
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Randy Moore

Re: [K3] Speaker buzz

As far as I know, those are shipped with the 2nd rx option, which I
don't have.

The Smiths wrote:

> Didn't you get the little foam doughnut that sticks to the back side
> of the speaker? This is there to do exactly what you are describing.
> If not, you should order one from Elecraft.
>
> > Date: Sat, 14 Aug 2010 10:44:54 -0500
> > From: [hidden email]
> > To: [hidden email]
> > Subject: [Elecraft] [K3] Speaker buzz
> >
> > Just completed my third K3/100 build (this one is actually mine!), and
> > like the other 2, this one had a speaker buzz (not heard through
> > headphones) at audio frequencies around 300 hz on CW, but this one
> > seemed worse. I fixed it by:
> >
> > 1. Lining the lip and inside of the speaker shield with one layer of 3M
> > electrical tape. This removed ~80% of the buzz.
> > 2. Putting a 1" long piece of same tape over the middle of the top edge
> > of both sides of the KPA3 module shield. This put tape between the top
> > edge of the shield and the top cover of the K3. This removed the
> > remainder of the buzz, and I now have clean CW tones through the
> speaker!
> >
> > 73,
> > Randy, KS4L
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html

The Smiths

Re: [K3] Speaker buzz

I stand corrected. you are right. Sorry. Thanks for the suggestion on the black tape idea.

> Date: Sat, 14 Aug 2010 15:25:00 -0500
> From: [hidden email]
> To: [hidden email]
> CC: [hidden email]
> Subject: Re: [Elecraft] [K3] Speaker buzz
>
> As far as I know, those are shipped with the 2nd rx option, which I
> don't have.
>
> The Smiths wrote:
> > Didn't you get the little foam doughnut that sticks to the back side
> > of the speaker? This is there to do exactly what you are describing.
> > If not, you should order one from Elecraft.
> >
> > > Date: Sat, 14 Aug 2010 10:44:54 -0500
> > > From: [hidden email]
> > > To: [hidden email]
> > > Subject: [Elecraft] [K3] Speaker buzz
> > >
> > > Just completed my third K3/100 build (this one is actually mine!), and
> > > like the other 2, this one had a speaker buzz (not heard through
> > > headphones) at audio frequencies around 300 hz on CW, but this one
> > > seemed worse. I fixed it by:
> > >
> > > 1. Lining the lip and inside of the speaker shield with one layer of 3M
> > > electrical tape. This removed ~80% of the buzz.
> > > 2. Putting a 1" long piece of same tape over the middle of the top edge
> > > of both sides of the KPA3 module shield. This put tape between the top
> > > edge of the shield and the top cover of the K3. This removed the
> > > remainder of the buzz, and I now have clean CW tones through the
> > speaker!
> > >
> > > 73,
> > > Randy, KS4L
> > > ______________________________________________________________
> > > Elecraft mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:[hidden email]
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list: http://www.qsl.net/donate.html