[Elecraft] VFO calibration

[Don Brown]

Hi

OK I will admit I haven't worked in a cal lab for 20 or so years and things
do change. However that was the way we did it back then. Glad to know it is
still usable even though more accurate methods are available now. WWV is
still hard to beat for the price ;-) It is still much more accurate than
anything the average ham is likely to have in his shack.

Don Brown
KD5NDB


----- Original Message -----
From: "Roy" <marion@montana.com>
To: "Don Brown" <DolfinDon@msn.com>; "Helmut Usbeck" <vze2gmp4@verizon.net>;
<elecraft@mailman.qth.net>
Sent: Sunday, December 29, 2002 3:46 PM
Subject: Re: [Elecraft] VFO calibration


> 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
>
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