[Elecraft] Question re: WWV fqy

[Jack Smith]

As transmitted, frequency error is less than 1 part in 10 to the -12th.

As received, due to Doppler error and other ionospheric issues, and 
depending on how you go about the measuring process, something like 0.1 
PPM is about it. Maybe a hair better if you have excellent propagation 
and you go about the comparison process correctly. Maybe 1 PPM 
off-the-air if you are doing a quick and dirty comparison, such as 
watching the S-meter swing around.

It's not at all uncommon to see a few tenths of a Hz short term Doppler 
shift on WWV at 10 MHz during unstable propagation conditions.

Jack K8ZOA



On 8/21/2012 3:15 PM, Dave KK7SS wrote:
> Please settle a debate among friends..
> How accurate are the WWV 5, 10 and 20 Mhz frequencies?
>
>   
> I'm saying 0.1ppm, my friend says 1.0 ppm.
>
> Looking on the NIST page I get lots of info about time accuracy.
> Couldn't find the info on frequency accuracy.
> A link, if possible, would be nice.
>
> Direct email is OK (avoids inflating the list)
>
> Thanks.
>
>
> --
> Dave G  KK7SS
> Richland, WA
>
> KX3 #097
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