Re: [time-nuts] Improving on basic L1 timing

Hi Michael, Thanks, that plot and the info gives a useful comparison. I think in light of everything, doing some tests with a generally upgraded setup would be the way to go for now. There would actually be several rubidiums, although initially with a bit of cheating - 1 counter, a 10PPS

Re: [time-nuts] Improving on basic L1 timing

>Make sure you have good skyview (aka good geometry) and very little >multipath. Both effects can affect the precision of your solution >much more than the ionospheric delay variation. Main one is on the peak of a slate roof. Nothing else much higher around except a large sycamore tree.

Re: [time-nuts] Improving on basic L1 timing

I promised a plot and here it is. In a bit more detail: (a) "GPSCV 800 km baseline" is single-frequency transfer between two 5071s with standard tubes. I've divided by sqrt(2), assuming both clocks contribute equally to TOTDEV. (b) "std tube spec" is from the 5071 manual, for comparison (c)

Re: [time-nuts] Improving on basic L1 timing

I should have added, if you do all of the above, the improvement in stability over just using a sawtooth-corrected PPS is not all that spectacular, a factor of two or three. I'll post a plot of some data tomorrow. Cheers Michael. On Wednesday, 15 June 2016, Michael Wouters

Re: [time-nuts] Improving on basic L1 timing

Hi With some searching and dedicated bidding, you can find older L1/L2 GPS gear fairly cheaply. It may take a year or two of bidding to get something you can use….That gets you back to the issue of “am I fiddling around waiting to do something or doing it”. Bob > On Jun 14, 2016, at 4:16 AM,

Re: [time-nuts] Improving on basic L1 timing

If you followed the link to www.openttp.org and are wondering where the software is, follow the link on the home page to GitHub and then look in the Develop branch. The ublox branch is for the new '8' series receivers. Cheers Michael On Tuesday, 14 June 2016, Michael Wouters

Re: [time-nuts] Improving on basic L1 timing

On Tue, 14 Jun 2016 21:37:20 +1000 Michael Wouters wrote: > On Tue, Jun 14, 2016 at 6:16 PM, Angus wrote: > > I'm planning to test some rubidiums again, but since Santa never did > > get me that hydrogen maser I asked for, I'm still stuck

Re: [time-nuts] Improving on basic L1 timing

Hello Angus If you have 3 rubidiums of similar stability + 3 counters, you could do a 3-cornered hat. Otherwise, GPS common view to a better clock may be an option. If you are reasonably close to a national standards lab, you might be able to use their time-transfer files to compare your

[time-nuts] Improving on basic L1 timing

Hi, I'm planning to test some rubidiums again, but since Santa never did get me that hydrogen maser I asked for, I'm still stuck with ordinary gps timing receivers as a separate medium to long term reference. The atmospheric issues are probably the main ones I would like to get rid of, although