[time-nuts] WWVB d-psk-r down conversion method...

paul swed paulswedb at gmail.com
Tue Sep 23 18:09:03 EDT 2014

OK this is shifting to an Xtendwave discussion and the magical chips.
Been trying to get some for a long time. They had some bare dies earlier
this year.
But thats a bit small for me to work on.
I don't really have any intent to use the Xtendwave chip for this project.
Maybe one day. I can see how it could be useful. Just this project has
taken on a life of its own and I want to wrap it up and get my old radios
running again. Silly as that may be considering good ole GPS and the
Jackson Labs GPDSOs.

On Tue, Sep 23, 2014 at 5:55 PM, Alexander Pummer <alexpcs at ieee.org> wrote:

> Hi Brooke,
> I hope that you are right with that chip, and despite the name change of
> the company -- now Xtendwave -- and recovering  they will deliver something
> some times. I can see that with correlation and averaging schemes the
> signal to noise ratio of data, perhaps constant frequency could be
> improved, but I would be very interested to see of the mathematical model
> of improving the signal to noise ratio of timing.
> Regards
> Alex
> On 9/23/2014 1:08 PM, Brooke Clarke wrote:
>> Hi Alex:
>> Sometime in the future there will be chips that will decode the new
>> signals (note the "s" on the end of that last word).  There are a number of
>> frame times the longest one of which takes 17 minutes and is transmitted
>> only once per day.  This format offers 23 dB modulation gain compared to
>> the 1 minute time frame transmission that the current clocks use.  There
>> are a total of 5 different modulation formats that will be transmitted over
>> different time frames.  In the end everyone should have a clock with more
>> frequent updates (on the West coast I might need to wait overnight for a
>> clock to sync after a battery change) and more accuracy.
>> http://prc68.com/I/Loop.shtml#PhaseMod
>> Have Fun,
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