Hi Well between now and midnight, you will completely loose signal at least once. It's a pretty dramatic amplitude dip as sunset gets right to the "wrong" place.
Bob On Jul 14, 2012, at 4:56 PM, paul swed wrote: > Bob > Yes nights are bad for me, east coast and MSF interference. > So it could be any number of 60 KHz crossing its just odd it lined up the > way it did and I double confirmed that I was not doing something silly like > using alternate triggers. > > Very careful analysis does show a 1-2 us jitter and at diurnal shift I > really expect something to change it has to. > Regards > Paul. > > On Sat, Jul 14, 2012 at 4:32 PM, Bob Camp <[email protected]> wrote: > >> Hi >> >> The "zero crossing" is very arbitrary. If it's correct at the transmit >> site, it will then be off everywhere else by the speed of light / distance. >> You will appear to be correct once every wavelength away from Colorado >> (roughly every 3 miles). You won't really be correct because you are >> looking at a different zero crossing. >> >> As long as you don't have sunset or sunrise between you and the >> transmitter, WWVB is reasonably stable. At night you will get more signal, >> but also can have some skywave "stuff" in the mix. >> >> Bob >> >> On Jul 14, 2012, at 3:50 PM, paul swed wrote: >> >>> OK have been doing a lot of experimenting. >>> I was curious what is the GPS tick in relationship to wwvb. Especially >>> since it is a reliable 1 sec marker. >>> Using a Tbolt since everyone has one on the list. ;-) And monitoring the >> 10 >>> us tick to the wwvb 60 Khz carrier on a scope. Amazingly and over at >> least >>> 2 hours now, the rising cycle of 60 Khz aligns to the 10 us Tbolt tick >>> rising edge. Expected some form of drift. >>> >>> Would not have actually thought there should be such a relationship or >> its >>> truly pot luck today. >>> WWVB today is also not running bpsk. >>> >>> Should such a relationship actually exist? >>> There is a clue in a 1985 article in ham radio magazine. >>> It went something like this. At any given instant the 60 Khz may jitter. >>> But for every 1 sec period there will be exactly 60,000 cycles. >>> >>> If it does stay aligned, then the cheating d-bpsk-r gets to be >> interesting >>> and very implementable. >>> >>> The approach using a micro to sample a squared up 60 Khz after the Tbolt >>> tic. >>> Perform 2-3 1 usec samples in the leading 90 degree signal. >>> Decide is it a 0 or 1 phase. >>> Select a inverted or non inverted 60 Khz into the output path to >> maintain a >>> constant phase 60 Khz for the old recvrs. >>> >>> Sure its cheating. But if this relationship is real I should be able to >>> implement the answer very quickly as a proof point. >>> >>> Have not heard if the NIST testing is completed or when the next one is. >>> But for today all of the rcvrs are working just fine. >>> Regards >>> Paul >>> WB8TSL >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
