[Elecraft] K3STFNR

[Guy Olinger K2AV]

I found that it cleaned up some birdies, as the heavy aluminum
stiffener plate does shield the board.  It takes the same time to do
two boards as to do one.  You can get RX microphonics as well, and
that can happen with both boards if you have the KRX3.

I did both of mine and I'm happy I did.

73, Guy.

On Wed, Apr 27, 2011 at 7:33 PM, Raymond Anderson <rayk8rdj at gmail.com> wrote:
> 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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