Re: New K3EXREF results

Posted by Matt Zilmer on Oct 29, 2011; 9:54pm
URL: http://elecraft.85.s1.nabble.com/New-K3EXREF-results-tp6944433p6944461.html

Results seem to be different for every TCXO.  My REF*CAL starts about
around .693 and settles to .778 after a couple hours.  I borrowed a
Rubidium clock from work and got nearly identical results.  The only
difference was freq source, so the chracteristics must be K3-specific.

Another K3 owner and I ran it on his (#35xx-something) and his started
at .717 and settled out at .798.  Same basic trends all around.

I'm also using the Trimble TB here; it's been active for ~six months
and results are always the same.  The K3's resolution is still +/- 1
Hz, but now you know your rig uses the right ref osc frequency.

The REF*CAL value shown is the compensation for the external freq
reference.  I'm not sure how Wayne calculates what's shown; maybe
he'll publish his secret sauce recipe...

73,
matt W6NIA

On Sat, 29 Oct 2011 16:38:41 -0500, you wrote:

>I just completed the install of my K3EXREF, and am feeding the 10MHZ reference from a Trimble Thunderbolt.
>
>After a couple of hours of warm up and settling out my reference osc is reading 49.379.945.  I have the OXCO and was expecting to have better results that are closer to 49.380.000.
>
>Are my expectations unrealistic?  Any suggestions?
>
>Mark Goecke KC5VF
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