K2 Rev B PCB - Does it contain the side-tone mod?

[dw-4]

Hey Gang,
I read online yesterday that it may be that the K2 control PCB Rev-B
might have incorporated the side-tone audio filter somewhere in advance
of the LM380N chip, to produce a waveform closer to sine-wave.

Does anyone know if this is true?

Is there anyway of getting to look at a silk-screen pic for this board?

Thanks
Duane
N1BBR
--
 [hidden email]

______________________________________________________________
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

[WE0H]

I emailed you scans of the board direct.

--
Mike
WE0H
K2 #6698




dw wrote:

> Hey Gang,
> I read online yesterday that it may be that the K2 control PCB Rev-B
> might have incorporated the side-tone audio filter somewhere in advance
> of the LM380N chip, to produce a waveform closer to sine-wave.
>
> Does anyone know if this is true?
>
> Is there anyway of getting to look at a silk-screen pic for this board?
>
> Thanks
> Duane
> N1BBR
>  

______________________________________________________________
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

[dw-4]

Ok,
I do see an 82mH shunt choke on the input of the 380N.
Thanks Don  :)

On Mon, 29 Jun 2009 14:02 -0400, "Don Wilhelm" <[hidden email]>
wrote:

> Duane,
>
> Those older mods have often been incorporated into the K2 design.  You
> will find a version of this mod already on your K2 - it was incorporated
> into the board for all K2 above SN 3000..
>
> 73,
> Don W3FPR
>
> dw wrote:
> > Hey Gang,
> > I read online yesterday that it may be that the K2 control PCB Rev-B
> > might have incorporated the side-tone audio filter somewhere in advance
> > of the LM380N chip, to produce a waveform closer to sine-wave.
> >
> > Does anyone know if this is true?
> >
> > Is there anyway of getting to look at a silk-screen pic for this board?
> >
> > Thanks
> > Duane
> > N1BBR
> >  
> > ------------------------------------------------------------------------
> >
> >
> > No virus found in this incoming message.
> > Checked by AVG - www.avg.com
> > Version: 8.5.339 / Virus Database: 270.12.94/2208 - Release Date: 06/29/09 05:54:00
> >
> >  

--
 [hidden email]

______________________________________________________________
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