[Elecraft] Oddity in K3 with new synthesizer

[Wes (N7WS)]

When I get time I'll have to look at this.  I have an old K3 with the original 
synthesizer and no TCXO and a new K3S with a TCXO.

I also now have a GPSDO.  After getting this, I checked the K3S and was not 
thrilled to see that the TCXO required a 20 Hz adjustment.

Wes  N7WS

On 3/5/2016 6:43 AM, brian wrote:
> Guys,
>
> I wonder if anybody else noticed this.  I'm wondering if there is an explanation.
>
> Picked up a high S/N K3 which has new syntheizers installed.  It also has the 
> TCXO installed.  No ref lock board.
>
> Looked at the pitch vs time from a Rb locked signal generator at 10 MHz.
>
> I see sawtooth variations in pitch of about 0.15 Hz peak-to-peak with periods 
> of about 30-45 seconds.
>
> Anybody else notice this?
>
> These variations do not show up when the identical experiment is performed 
> using a TS-480 with high stability oscillator.  Rather all variations are 
> smooth.  They did not show up on an older K3 with the old synthesizer boards.
>
> Yes the variations are small but the discontinuous nature is of some concern.
>
> 73 de Brian/K3KO