[time-nuts] Re: Looking for QEX 2019 July/August

Hi Steve Looks like it's "Themis" not "Temis" which may help your searching. The ToC says the article's on p3 not p12. The schematic from the article is freely available from ARRL. The same

[time-nuts] Re: Phase coherence with 2x GPSDO

kb...@n1k.org said: > If your drone is moving at 15 KPH, that???s a bit over 4 m/s. Roughly > speaking, you would need updates at > 10 per second to keep this from > dominating the result. This would be true of both survey and direct time of > flight measurements. Do I really need that

[time-nuts] Looking for QEX 2019 July/August

Greeting list I am looking for a article printed in QEX 2019 July/August The Temis is listed on page 12 Any leads would be helpful THANKS -- Steve KD0PXX ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to

[time-nuts] Re: Phase coherence with 2x GPSDO

Hi The timestamping in a real implementation should be done in the FPGA or on a SoC integrated in the FPGA. Since you have a SDR you could implement a timestamping core. This timestamping core takes the samples from the ADC and calculates the time of arrival relative to the sampling clock. If you

[time-nuts] Re: Phase coherence with 2x GPSDO

Hi If you have a clock in motion and want to send it a time signal, the speed of light will always get into the process. A nanosecond is roughly 30 CM. To hit a half nanosecond, you need to know the location to within 15 CM. If you are doing this by survey techniques ( = GPS), that would be

[time-nuts] Re: An update on my Efratom FRK with "inoperative lamp"

Its been a long thread and quite an effort by Julien. We hate equipment being bad. Julien I could have sworn you did get the lamp to ignite. Is that false? You had heated the lamp up to release the rb that may have plated out on the wall also. I remember doing that and there was actually a small

[time-nuts] Re: One-night experiment: empirically verifying that the west coast power grid is actually interconnected

>> Wow! I was not expecting the two curves to match up so well. What a beautiful result! >The effective impedances of the power grid are very low, so frequency >discrepancies are almost physically impossible. I should clarify my amazement (since I've gotten a couple of "of course they match"

[time-nuts] Re: An update on my Efratom FRK with "inoperative lamp"

Hi Adding insulation to an Rb is a very tricky thing. There are two heated zones. They need to both be at the correct temperature. If the “cold one” gets to hot, things stop working. No, this isn’t the root cause issue here. If you bulb does not light then that’s the root cause. Bulbs do go

[time-nuts] Re: Phase coherence with 2x GPSDO

Hello Mattia, Thanks for the paper. Please correct me if I understood wrong, but it seems like you are calculating the time of flight between timestamped signals to synchronize two spatially separated clocks. Since there is some non-deterministic computational overhead, you need to take several

[time-nuts] Re: One-night experiment: empirically verifying that the west coast power grid is actually interconnected

p...@phk.freebsd.dk said: > If you want to see the real trouble, you need to GPS referenced high > resolution phase measurements in two or more locations, and then plot the RMS > of their differences. Suppose I get a time stamp on the first zero crossing of each second. How accurate do they

[time-nuts] Re: One-night experiment: empirically verifying that the west coast power grid is actually interconnected

It ought to be possible to build inertia, electronically, into inverters. The maths can't be difficult to fathom-out, then DSP can do the rest. BUT to allow this to be possible, in normal usage the solar/wind/whatever source must be operating at a level significantly below what it can give out,

[time-nuts] Re: One-night experiment: empirically verifying that the west coast power grid is actually interconnected

Jeremy Elson writes: > Wow! I was not expecting the two curves to match up so well. What a beautiful > result! The effective impedances of the power grid are very low, so frequency discrepancies are almost physically impossible. If you want to see the real trouble, you need to GPS

[time-nuts] Re: 20210423: Introduction and Request for Spirent GSS4200 User Manual / Help

This is a follow-up on my experience with the GSS4200 Multi-channel GPS Simulator from Spirent. I was able to finally get the elusive "Utilities Disk" for the GSS4200, which includes the USB drivers and several utilities (talk over USB, talk over GPIB, combine scenarios into a scenario library,