[time-nuts] WWVB format change in 2012

jimlux jimlux at earthlink.net
Mon Feb 29 08:25:03 EST 2016


On 2/29/16 3:39 AM, Hal Murray wrote:
>
> tic-toc at bodosom.net said:
>> If you can get audio they work.  The documented accuracy for WWV is within 1
>> millisecond of the time pulse.
>
> Where is that documented and/or can anybody verify that they get results in
> that range?
>
> What is the (ballpark) of the day/night shift?
>
>
https://www.febo.com/pages/hf_stability/ shows the "about 1 Hz" 
variation one sees in various places.

That's the apparent variation in frequency which is really the phase 
shift changing during sunrise/sunset.

Looking at the 10 MHz data, it looks like there's a 0.1 Hz change 
lasting about 2 hours.  I think that's a change of 720 cycles, or 72 
microseconds at 10 MHz.


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