KX3 sidetone booster

[Mike Maloney]

Getting a nice boost from the stock speaker (MON level 2) at my preferred pitch of 500Hz.   Booster is a 12-3/4 inch piece of 1-1/4" PVC tube (1-5/8"OD) with one end cut at 30 deg. Placed approx. 1/8 inch from the speaker holes gives the best gain.   Tube would be slightlyshorter for higher pitch tone.  Easy to find the peak by swinging the pitch tone.   A slider sleeveon the end allows adjusting to desired pitch.   For CW ops it is really nice having the additionalaudio boost at your preferred pitch.   I pass this on FYI to those who may like to try it themselves.  
73,
Mike AC5P


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[Ken G Kopp]

Hi Mike!

You've unknowingly re-invented the somewhat famous SKYTEC CW-1
speaker, made in Ukiah, CA a number of years ago.  It uses a sliding
tube to establish resonance.

 FWIW, I have a couple of them.

73!

Ken Kopp - K0PP

On Wed, Oct 2, 2019 at 12:19 PM Mike Maloney <[hidden email]> wrote:

> Getting a nice boost from the stock speaker (MON level 2) at my preferred
> pitch of 500Hz.   Booster is a 12-3/4 inch piece of 1-1/4" PVC tube
> (1-5/8"OD) with one end cut at 30 deg. Placed approx. 1/8 inch from the
> speaker holes gives the best gain.   Tube would be slightlyshorter for
> higher pitch tone.  Easy to find the peak by swinging the pitch tone.   A
> slider sleeveon the end allows adjusting to desired pitch.   For CW ops it
> is really nice having the additionalaudio boost at your preferred pitch.
> I pass this on FYI to those who may like to try it themselves.
> 73,
> Mike AC5P
>
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

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