Hi > On Aug 6, 2020, at 4:40 PM, jimlux <jim...@earthlink.net> wrote: > > On 8/6/20 9:17 AM, Taka Kamiya via time-nuts wrote: >> Someone in this thread mentioned "at least 2 satellite time and frequency >> solutions" exists already. I only know of GPS (GNSS) constellations. >> What's the other? > > Transit? > > I don't believe they are still operational, though. > > > I wonder if one might be able to pick up time/frequency from a commercial TV > broadcast transponder. The transponders on the satellite are typically bent > pipes (for C-band anyway), I would assume that the uplinks may or may not > have stability comparable to terrestrial broadcast. > > One problem is, of course, that the satellites aren't in a stable location > (at least on a "meters" scale) - but one could certainly do "common view" > kinds of time transfer.
Another couple of “up in the air” question: Some of the systems transmit “stand alone” signals in each of two or three different bands. Does each band count as a separate time source? If you know your location already, each sat in these systems can be a time source all by it’s self. Do they each count? I guess is depends a lot on just how you look at redundancy …. Bob > > > > >> --------------------------------------- >> (Mr.) Taka Kamiya >> KB4EMF / ex JF2DKG >> On Thursday, August 6, 2020, 12:01:27 PM EDT, paul swed >> <paulsw...@gmail.com> wrote: >> Magnus >> Its honestly by luck that I know anything. From the bits I have read Europe >> seems far closer to eLORAN then we are. Perhaps 6 months ago the US >> performed a series of tests 2 eLoran solutions and something like 6 or more >> satellite solutions. I know the old Iridium satellites were in the tests >> and some other LEO satellites. >> But thats about it. >> What we need is a cheap SDR LORAN C sniffer. Low power runs 24 X 7 and >> turns a LED on if the stations active. >> Oh well another project in the someday pile. >> Regards >> Paul >> WB8TSL >> On Thu, Aug 6, 2020 at 2:42 AM Magnus Danielson <mag...@rubidium.se> wrote: >>> Hi Paul, >>> >>> I only ask as you seem to track this thing the best here on time-nuts, >>> as far as I have seen, such that it is your emails that keeps me best up >>> to date with the progress. >>> >>> Cheers, >>> Magnus >>> >>> On 2020-08-05 19:21, paul swed wrote: >>>> Hi Magnus been a while since have emailed. >>>> Its one site that was a test transmitter. Its in New Jersey, USA. >>>> The goal of the testing I believe is to establish the viability of an >>>> alternate PNT reference to GPS. Additionally the ability to communicate >>>> some level of message broadcast. This should be identical to proposals I >>>> have heard of in Europe. >>>> But I have no direct relationship to any of this. Like you, a very >>>> interested observer and hope that eLORAN wins the battle. >>>> Unfortunately there are many alternate proposals such as using other >>>> satellites. Hmmm if I wanted to advance my career in the Air Force or >>> Space >>>> Force (Yes thats actually real now). >>>> Would I select the lowly reliable as heck eLORAN at sub $100 M/year to >>>> operate. Or the glorious space based proposals in $B region. Never mind >>>> that at least 3 countries now have demonstrated killer satellites. >>>> Sorry for that editorial. >>>> Regards >>>> Paul >>>> WB8TSL >>>> >>>> On Wed, Aug 5, 2020 at 11:04 AM Magnus Danielson <mag...@rubidium.se> >>> wrote: >>>> >>>>> Hi, >>>>> >>>>> Do you know that they would do test with two actual transmitter sites? >>>>> >>>>> Cheers, >>>>> Magnus >>>>> >>>>> On 2020-08-05 16:00, paul swed wrote: >>>>>> Hello to fellow time nuts. >>>>>> Warm up those old Austrons. eLORAN out of New Jersey has been on the >>> air >>>>>> intermittently prior to a test run next week. Due to the storm they >>> have >>>>>> lost power and should have it back today or tomorrow. >>>>>> The intention will be on the air operation till the 20th. That's a long >>>>>> run. Nice. >>>>>> Seems the Austron 2100s can be had for reasonable money these days >>> also. >>>>>> Enjoy. >>>>>> Paul >>>>>> WB8TSL >>>>>> _______________________________________________ >>>>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>>>> To unsubscribe, go to >>>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>>>> and follow the instructions there. >>>>> _______________________________________________ >>>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>>> To unsubscribe, go to >>>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>>> and follow the instructions there. >>>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>> and follow the instructions there. >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.