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

paul swed paulswedb at gmail.com
Fri Sep 25 09:26:11 EDT 2015


Charles like you I have quite a few gpsdo's that are far superior to wwvb
at least on the east coast in reality. But all of that said I actually used
wwvb more for propagation studies to watch the ionosphere. Its always been
interesting.
Not that any of it matters if all of GPS is gone my real interest will be
water, food, and heat.
I certainly spent the time building doublers, costas loops, and a large box
full answers that do not depend on GPS and yes they work till they skip a
cycle and you get a 180 degree phase shift in the chart. Those have been
shared with Time-nuts over the years. There are other approaches I may also
explore now that I have the codes figured out. But after 3 years a break
would be good and after all it was a 90 day project. Ooops that wasn't the
case.

I am looking forward to someone releasing a SDR version completely
independent of GPS. But at that point there is no longer a need for the old
receivers either as it can all be done very nicely in software complete
with phase measurements in about 2 Lbs and 5 watts.

I am scratching my head a bit here. It seems as though the 500 KB document
may have come through. But I never received a copy.
Regards
Paul.
WB8TSL

On Thu, Sep 24, 2015 at 5:11 PM, Charles Steinmetz <csteinmetz at yandex.com>
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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