[Elecraft]K3 Open Pot on 52.450 mhz

[John Buck]

I confirm this on S/N 125 FW version 2.63
DATA mode on 52.445.81.
The K3 is very microphonic at that frequency in Data mode. 
The frequency changes with SHIFT and with MODE and crystal filter XFIL 
selection.
With 1.8k filter the tone is found at 52.447.66 at a lower level and the 
microphonic effect is less. 
With the 500Hz filter the tone is heard at 52.446.75.  Just a little 
microphonic with the narrow filter.  The frequency jumps appear to be 
related to the filter frequency offset setting.

For me this is not an issue as long as it does not show up elsewhere, 
but the tone could be important for some transverter users.
Oh my!  Did we finally find something to complain about or will Wayne 
and Lyle make it go away as usual?  I certainly hope this will not 
become a distraction from the existing to do list.

Aloha,
John KH7T (K3 #125, practically perfect and getting better every day)

Mike McLendon wrote:
> I think all K3s probably do this.  Mine does at 52.445.81!  I suspect we are
> listening to the synthesizer and the vibrations a modulating the frequency
> via a mechanical path to the L component in the oscillator. 
>
> Mike, KE4U
>
>
>