[time-nuts] eLORAN in the Antipodes ? (was: Re: eLORAN will be on the air GRI 99600)

Hi, Been following this thread with the usual mixture of joy, awe and wonder (truly!) - fantastic stuff :) My read of the situation is that there is next to no chance of receiving any meaningful signal at the VLF frequencies in question down here in Melbourne - a great circle path of some

Re: [time-nuts] eLORAN will be on the air GRI 99600

I some tests I was fortunate to be a part of the eLloran system was able to deliver very accurate time even in buildings. I won't quote numbers as it was 5 years ago. But suspect the details are online. The extra data channel allows for the transmission of various corrections. Regards Paul On

Re: [time-nuts] eLORAN will be on the air GRI 99600

I probably need to clarify where I'm coming from in relation to my previous message. I have a fair bit of background in dealing with using GPS clock sources for synchronization at communication sites. Many of these sites are lucky to have a rubidium oscillator in place for holdover, although

Re: [time-nuts] eLORAN will be on the air GRI 99600

Hi > On Aug 6, 2020, at 7:28 PM, Forrest Christian (List Account) > wrote: > > If you look at generally-available GNSS PNT solutions, you'll find a few > failure modes: > > 1) Loss of a satellite (or two). This is why the constellations have more > satellites than is strictly necessary, so

Re: [time-nuts] eLORAN will be on the air GRI 99600

jim...@earthlink.net said: > Transit? > I don't believe they are still operational, though. Wikipedia says first operational satellite navigation system. https://en.wikipedia.org/wiki/Transit_(satellite) Some/mot of the GPS history talks/articles give credit to it. They had a portable

Re: [time-nuts] eLORAN will be on the air GRI 99600

On 8/6/20 4:28 PM, Forrest Christian (List Account) wrote: If you look at generally-available GNSS PNT solutions, you'll find a few failure modes: 1) Loss of a satellite (or two). This is why the constellations have more satellites than is strictly necessary, so not a big deal. 2) Loss of

Re: [time-nuts] eLORAN will be on the air GRI 99600

Transit 5B-5 (from 1965) is nuclear powered and still transmitting. Nobody has any idea how to pull out the time code, though! https://twitter.com/coastal8049/status/1260802699051692033 On Thu, Aug 6, 2020 at 4:43 PM jimlux wrote: > On 8/6/20 9:17 AM, Taka Kamiya via time-nuts wrote: > >

Re: [time-nuts] eLORAN will be on the air GRI 99600

If you look at generally-available GNSS PNT solutions, you'll find a few failure modes: 1) Loss of a satellite (or two). This is why the constellations have more satellites than is strictly necessary, so not a big deal. 2) Loss of control/failure in the control system/constellation wide

Re: [time-nuts] eLORAN will be on the air GRI 99600

On 8/6/20 2:22 PM, Bill Notfaded wrote: Isn't there also CDMA? We used a EndRun Technologies system not long ago that used a small short antenna that could be located inside and didn't need a cable to the roof for a GPS antenna. This was handy for rooms that couldn't have anything penetrate

Re: [time-nuts] eLORAN will be on the air GRI 99600

Hi The problem with CDMA timing is that not all network operators sync their systems to GPS in all areas. That results in some really strange timing issue when using one of the CDMA based devices. More or less, Symmetericom got a *lot* of devices into the field before they found that out …..

Re: [time-nuts] eLORAN will be on the air GRI 99600

I think CDMA in this case is part of a cellular phone network, not a satellite system. --- (Mr.) Taka Kamiya KB4EMF / ex JF2DKG On Thursday, August 6, 2020, 5:40:49 PM EDT, Bill Notfaded wrote: Isn't there also CDMA?  We used a EndRun

Re: [time-nuts] eLORAN will be on the air GRI 99600

On Thu, Aug 6, 2020 at 10:40 PM Bill Notfaded wrote: > > Isn't there also CDMA? We used a EndRun Technologies system not long ago > that used a small short antenna that could be located inside and didn't > need a cable to the roof for a GPS antenna. This was handy for rooms that > couldn't have

Re: [time-nuts] eLORAN will be on the air GRI 99600

Transit has been off the air some 20+ years. It really was one of the beginnings of satellite navigation. Regards Paul On Thu, Aug 6, 2020 at 5:40 PM Bill Notfaded wrote: > Isn't there also CDMA? We used a EndRun Technologies system not long ago > that used a small short antenna that could be

Re: [time-nuts] eLORAN will be on the air GRI 99600

Isn't there also CDMA? We used a EndRun Technologies system not long ago that used a small short antenna that could be located inside and didn't need a cable to the roof for a GPS antenna. This was handy for rooms that couldn't have anything penetrate the walls at all. It was a good reference

Re: [time-nuts] eLORAN will be on the air GRI 99600

Hi > On Aug 6, 2020, at 4:40 PM, jimlux 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? > >

Re: [time-nuts] eLORAN will be on the air GRI 99600

Both China and India also have Geostationary satellites for Navigation. It compliments their MEO satellites. Regards Paul. On Thu, Aug 6, 2020 at 4:43 PM jimlux 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 >

[time-nuts] eLORAN 99600 on the air

At least here in Boston its noisy and at only -110dbv. Normally I see it at -70 dbv. The FS700 doesn't detect it the Austrons seem to. Regards Paul WB8TSL ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

Re: [time-nuts] eLORAN will be on the air GRI 99600

Iridium but not available for general use. But there are actually more proposals then GPS and Iridium. Some might call it Piles-of-satellites. LEO stuff. $$$ Regards Paul WB8TSL On Thu, Aug 6, 2020 at 3:48 PM Taka Kamiya via time-nuts < time-nuts@lists.febo.com> wrote: > Someone in this thread

Re: [time-nuts] eLORAN will be on the air GRI 99600

Hi The Russians put up the Gloanss system many years ago. It took a while to get all the kinks out of it. It has been running pretty well for over a decade: https://en.wikipedia.org/wiki/GLONASS The European Union is in the process of fleshing out the

Re: [time-nuts] eLORAN 99600 on the air

Sorry system error I was on the 80 meter vertical. That is -110. The active preamp feeding the LORAN receivers is its good old -72 dbv. Let it settle in and I can confirm my GPSDO. Chuckle. Its working fine. Good luck Paul WB8TSL On Thu, Aug 6, 2020 at 4:24 PM paul swed wrote: > At least here

Re: [time-nuts] eLORAN will be on the air GRI 99600

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

Re: [time-nuts] eLORAN will be on the air GRI 99600

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?  --- (Mr.) Taka Kamiya KB4EMF / ex JF2DKG On Thursday, August 6, 2020, 12:01:27 PM EDT,

Re: [time-nuts] another source of time...

Just listen on HfF or example about 17m (18MHz) , with a wide band digital receiver with a waterfall display. If the band is open at all, you will see them sweeping up every few minutes. Lester B Veenstra  K1YCM MØYCM W8YCM 6Y6Y les...@veenstras.com 452 Stable Ln (HC84 RFD USPS Mail) Keyser

Re: [time-nuts] eLORAN will be on the air GRI 99600

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

Re: [time-nuts] eLORAN will be on the air GRI 99600

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

Re: [time-nuts] another source of time...

On 8/5/20 4:18 PM, Mark Haun wrote: I wonder if someone maintains a directory of ionosondes.  Seems like waste/duplication to have every interested party set up their own, instead of piggy-backing on what's already out there.  There's also the pollution factor---one certainly hears them often