[Elecraft] K3STFNR

[Raymond Anderson]

Hi Bill

   You would only need to mod the main board as the second is never used on
transmit so does not have a problem.
    I would go ahead and add it so if you should ever want to use the
internal speaker you could without problems.

Ray K8RDJ

On Wed, Apr 27, 2011 at 6:37 PM, Bill W4ZV <btippett at alum.mit.edu> wrote:

>
> Richard Thorpe-2 wrote:
> >
> > I am awaiting the K3EXREF mod to become available.  While I have my K3
> > apart should I upgrade and add the K3STFNR plates to the two synthesizer
> > boards in my K3.  I've checked the archives with mixed results as to the
> > efficacy of this mod.  Any opinions out there?  Thank you.
> >
>
> The problem this solves is audio modulation of the VCO by the internal
> speaker which can cause spurs at the modulation frequency around the
> fundamental.  If you don't use the internal speaker and don't run external
> speakers at the threshold of pain, the mod is probably unnecessary.  I
> nearly always use headphones so it's not an issue.
>
> 73,  Bill  W4ZV
>
>
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