[Elecraft] VFO calibration

Sun Dec 29 12:50:00 2002

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

----- Original Message -----
From: "Helmut Usbeck" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 29, 2002 11:20 AM
Subject: [Elecraft] VFO calibration

>
> -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.
>
> -Here's a fly in the ointment.  I wanted to post this a couple weeks ago
> and forgot about it.  I was looking at the sidetone using an external
> 700 Hz filter on my K2 which I have set to 700 Hz.(that's the tone I like
> and found that it wasn't at 700, it was at 711Hz.  So we have an
inaccuracy there also.
>
> -Still love my little K2 transceiver though, warts and all.  This rig is a
> hobby unto itself.
>
> -Helm.
>
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