Installing K2 Internal Mic Adaptor

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Installing K2 Internal Mic Adaptor

Roy Morris-6
My K2 is an early serial number (2###).  I am getting ready to install a K2
Internal Mic Adaptor that fits between the control board and the front panel
board.  There is a rather large component I mounted years ago on RP5 to
smooth the sidetone.  This component (I believe it is a 47uF cap but not
sure) needs to be removed or relocated in order to install the mic adaptor.
Any suggestions would be appreciated.  Thanks   Roy Morris  W4WFB

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Re: Installing K2 Internal Mic Adaptor

Don Wilhelm-4
Roy,

I would suggest removing the capacitor and adding the 82 mHy shielded
choke that is included with the A to B mod kit.  Yes, you will also have
to add a 47k resistor in series with C24 (see the K2 A to B
instructions).  That will make the sidetone smoothing equal to the post
3000 SN K2s.

The 82 mHy inductor will be positioned high enough on the Control Board
that it is out of the way for the installation of the IMA.

73,
Don W3FPR

On 8/23/2011 11:14 AM, Roy Morris wrote:

> My K2 is an early serial number (2###).  I am getting ready to install a K2
> Internal Mic Adaptor that fits between the control board and the front panel
> board.  There is a rather large component I mounted years ago on RP5 to
> smooth the sidetone.  This component (I believe it is a 47uF cap but not
> sure) needs to be removed or relocated in order to install the mic adaptor.
> Any suggestions would be appreciated.  Thanks   Roy Morris  W4WFB
>
> ______________________________________________________________
> 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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Please help support this email list: http://www.qsl.net/donate.html