[time-nuts] wwvb gps d-psk-r details

John Ackermann N8UR jra at febo.com
Fri Sep 25 09:15:26 EDT 2015


I may be remembering incorrectly, but I thought that you only need the 
GPS for initial sync; after that shouldn't the processor be able to 
maintain the sequence without new GPS input, so long as the timer clock 
doesn't drift too badly?  From a known starting point, the modulation 
pattern should be predictable into the future.

John
----

On 9/24/2015 5:11 PM, Charles Steinmetz wrote:
> Paul wrote:
>
>> Here is the detailed document on the wwvb d-psk-r.
>
> Interesting solution, and a good study in persistence.
> Congratulations!  But I thought the main point of having a working WWVB
> receiver was as a backup if GPS fails (or for use in circumstances where
> WWVB reception is possible but not GPS reception).  If GPS is working,
> and you have a GPS rx/GPSDO, what is the point of having a time and/or
> frequency source that relies on GPS but only has the precision of WWVB?
> And what good is the predictive de-psk-r when GPS is not working?
>
> [Yes, I get that if one runs a museum it's nice to have working exhibits
> even if they are simulated, and it's no big deal if the exhibits don't
> work from time to time.  But the curator's solution doesn't seem to
> solve the time-nuts' real problem.]
>
> I hasten to add that I don't really care one way or the other about GPS
> alternatives, particularly alternatives with the relative imprecision of
> WWVB over time scales shorter than geological.  Personally, I presume
> that if there is ever a persistent, system-wide GPS failure it will be
> due to a natural or man-made catastrophe of earthshaking proportions
> (literally) and there will be many, more urgent concerns than time-nuts'
> experiments.  But others have expressed concern over having just one
> time and frequency standard available.  For them, isn't a fully
> independent solution that does not rely on GPS required?
>
> Again, congratulations on bringing this idea to fruition.
>
> Best regards,
>
> Charles
>
>
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