Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Magnus, Thanks for the detailed reply. I haven't had a need (read: no customer has paid me to do so...) to wallow through the GPS ICD, so that document is foreign to me. Your explanation clarifies the situation... Now it makes sense. Thanks! -Chuck Harris Magnus Danielson wrote: Chuck,

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

GPS Time ignores (does not deal with) "Leap Seconds." It is dealt with in the software translation from GPS time to UTC or local time. That is part of the reason there is a 16 second time difference between GPS Time and UTC/local time. --- Graham == On Mon, Nov 9, 2015 at 4:15 PM, Chuck Harris

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

paulsw...@gmail.com said: > Hmmm then why do I have to figure it out at all? I don't care what the date > says. > Only that the Austron locks and does its frequency offset compare. It would > be great not to have to do this. If you don't care about the date, then don't worry about it. It will

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Hmmm then why do I have to figure it out at all? I don't care what the date says. Only that the Austron locks and does its frequency offset compare. It would be great not to have to do this. Regards Paul WB8TSL On Sun, Nov 8, 2015 at 9:06 PM, Magnus Danielson wrote:

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Well for the heck of it I just fired the austron 2201 up. Date was circa 1980 or something way back. Guess the battery went. That said set the date and time to UTC and let it go. Almanac seems to grab a satellite every now and then but it does not go into the full track mode. I normally cheat this

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Seems to me that there is more to this than just getting the displayed date wrong. It is true that the date will present wrongly, but what about leap seconds? If the GPS week rolls over at 1024, how will the GPS figure out which is the proper calendar date to apply the leap second? -Chuck

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

OK great conversation. Not sure when but far sooner then later will fire the system up and just let it run for a week. Regards Paul WB8TSL On Mon, Nov 9, 2015 at 1:09 PM, Hal Murray wrote: > > paulsw...@gmail.com said: > > Hmmm then why do I have to figure it out at

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Chuck, Because all the leap-second info is kept in GPS-calender form, and essentially indicating current leap-second difference and which GPS week (modulo 256). Check out the ICD for yourself, IS-GPS-200H: 8<--- 20.3.3.5.2.4 Coordinated Universal Time (UTC). Page 18 of subframe 4 includes:

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

An update on this just in case anyone else interested... I've confirmed that the Symmetricom CDU software for the Proteus GPS unit will run fine under Windows 7 on a 2009 HP dual-core laptop using a Prolific USB to RS232 convertor. There is no option to select baud rates etc in the

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Why is this an issue? Sent from my iPad > On Nov 8, 2015, at 1:00 PM, "Brendan Giles" wrote: > > > > I was the project manager who was in charge of the NAVSTAR proteus GPS time > and frequency unit.The two GPS rollover dates 1999/2018 were tested in > product

[time-nuts] NAVSTAR proteus GPS time and frequency unit

I was the project manager who was in charge of the NAVSTAR proteus GPS time and frequency unit.The two GPS rollover dates 1999/2018 were tested in product test plan. Also various dates were checked upto 2037 for the PC output message. Brendan Giles

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Because the roll over is a pain. Thats good engineering if they checked that far. What happens if you have a receiver that doesn't handle it correctly is you do not tend to get satellite lock because the dates all wrong. You cheat this "The pain part" by figuring out what the date should have been

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Thanks. What I intended to ask is why the problem exists, not implying that it doesn't matter. Rob, NC0B Sent from my iPad > On Nov 8, 2015, at 6:30 PM, "paul swed" wrote: > > > > Because the roll over is a pain. > Thats good engineering if they checked that far. >

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Hi Steve, I've got one of these, also came to me new in the box but that was around twelve years ago and other than a short period of testing has stayed there ever since, nothing wrong with it as far as I can remember just too much stuff, too much to do, and Thunderbolts and the like do

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

For multiple reasons I install serial cards in my Win7 desktops. On the issue of the Win95 program, it may not run because the CPU is too fast. Rob NC0b Sent from my iPad > On Nov 4, 2015, at 7:02 PM, "paul swed" wrote: > > > > Steve > My very small 10 cents. > I am

[time-nuts] NAVSTAR proteus GPS time and frequency unit

Hi all, I have the chance to buy a new boxed unit. Having glanced at the manual I understand that the configuration software runs under Windows 95 and uses a serial RS232 port. The only Windows box I have now runs Windows 10 and has USB only. So my questions are, can I run the config software

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Hi In general running Win 95 software on Win 10 is not a real good bet. It’s slightly more likely to work with Win 10 Pro than with the entry level version. Bob > On Nov 4, 2015, at 2:25 PM, Stephen Farthing wrote: > > Hi all, > > I have the chance to buy a new boxed

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Steve My very small 10 cents. I am pretty sure win 95 had no idea what USB is. I think thats was win98 sp2 region. Certainly win10 wouldn't understand what that program was. But that said there are dos emulators/virtual machines that might let you get away with it. The other comment is if the