[time-nuts] WWVB Disciplined Oscillator

[Bob kb8tq]

Hi

The gotcha with WWVB is correcting for the day / night ionosphere issues. Since they are not 
100% predictable, it’s not a real easy problem to solve. Toss on top of the the ambiguous status
of WWV or WWVB ( = will it be there next year …. if so in what format ….????) there layers and 
layers.

Best guess is that WWVB at a “one day” sort of range is a 10 ppt sort of thing. At the same observation
time, GPS is a < 0.1 ppt sort of thing. If the objective is accuracy … WWVB come in a bit far back ….

Bob

> On Apr 6, 2019, at 7:27 PM, Wayne Holder <wayne.holder at gmail.com> wrote:
> 
> Perhaps this has been mention before, but I found the following document
> while researching some details on WWVB and thought it might interest the
> group:
> 
>  https://www.kevincroissant.com/WWVB/WWVB_PTTI_2018.pdf
> 
> I know that Spectracom once made a WWVB Disciplined Oscillator in the form
> of the Model 8164, but I figured that this approach probably was obsolete
> in the era of GPS and network-based time. However, the author seems to have
> produced some interesting results.  Has anyone else built, or tried to
> build a WWVB Disciplined Oscillator?
> 
> Wayne
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