[Elecraft] VFO calibration

[Roy]

At 11:47 AM 12/29/02 -0600, Don Brown wrote:
>Hi
>
>Actually as some who worked in several calibration labs (Tektronix, GE and
>several independents)
>That is exactly what we do. The frequency standard in most cal labs is a
>special receiver that is phase locked to the WWV carrier. The calibration
>certificates state that the instrument is traceable to NBS. WWV is part of
>the NBS so it is the standard all other standards are compared to and even
>if a lab is using a rubidium or cesium standard they are calibrated against
>the ones at NBS. The WWV carrier is phase locked to their internal standard
>and the several standards are compared to each other to maintain the
>reference.
>
>Don Brown
>KD5NDB
>
>----- O
>
> >
> > -Someone mentioned that all counters are calibrated against WWV.  I don't
> > know where that urban (or rural) legend came from.  If you think that
> > down at H-P techs are zeroing in counters with an old Grundig tuned to 10
> > Mc. you're off.  I had mine sent to a lab where it was compared to a
>rubicon
> > standard.  Which of course is what WWV uses as it's standard.


  At the NIST lab I work
   at, we have not used the WWV method for quite a few years now. But it 
worked fine when we did. Now we sync our cesium to a signal from GPS.  Then 
we sync our rubidiums using the cesium. The GPS is now considered an 
"absolute standard" . Time marches on!  Couldn't resist that one. 73 Roy AB7CE