[time-nuts] Nuclear transition for time reference - Nature 5-May, 2016, vol 533

My knowledge in this area is superficial. But I wondered if anyone in this group had a reaction to the 5-May issue of nature that includes a 'News and Views' piece and a formal article reporting the detection by Von der Wense et al. of the 229m Thorium nuclear transition that is hoped to have

Re: [time-nuts] Simple solution for disciplining OCXO with 1 PPS

> >> If that sounds too weird, I am open to receive advises for a microcontroller >> based solution. > > If you want to go that way, probably the simplest solution would be to > take one of Nick Sayers boards, pull out the GPS receiver and feed the > PPS input from your GPS receiver. It’d be

Re: [time-nuts] Get together at IMS?

I'll be there all day Wednesday. I'll try to meet you guys at 5 PM. Rick Karlquist N6RK On 5/22/2016 9:06 AM, Bernd Neubig wrote: Agreed! See you on Wed at 5.00pm at Booth 714 (Dynamic Engineers) -Ursprüngliche Nachricht- Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag

[time-nuts] FE-5680A GPSDO controller also works with FE-5650A

Hello Time-Nuts, Nick Sayer's GPSDO controller will also work with the FEI FE-5650A rubidium oscillators as well. A small modification is needed to the board, but is rather trivial. First, the 5680 outputs 10MHz on pin-7 of the DB-9, the 5650 has a separate SMA connector. So, pin-7 needs to be

Re: [time-nuts] FE-5680A GPSDO controller also works with FE-5650A

> On May 23, 2016, at 11:34 AM, Skip Withrow wrote: > > Hello Time-Nuts, > > Nick Sayer's GPSDO controller will also work with the FEI FE-5650A rubidium > oscillators as well. A small modification is needed to the board, but is > rather trivial. > > First, the 5680

[time-nuts] Looking for a Linux user with a Z3816/Z3815/HP5xxxx

I have added some code to Lady Heather to talk to SCPI GPSDOs (also Motorola, Ublox, and NMEA) and am looking for a guinea pig to test it... I have a Z3801A and want to see if it is also 3815/3816/etc compatible. Please contact me off list. I might be able to send a WIndows .EXE , but a lot

Re: [time-nuts] 1937 Time Standard

Thanks Paul. I accumulate a pile of PDF's over time and when the right question shows up in the list I dig them out. It turns out Thomas, the OP, is doing a report on public clocks, including synchronous motor clocks. He added another source:

Re: [time-nuts] Looking for a Linux user with a Z3816/Z3815/HP5xxxx

On Mon, 23 May 2016 23:22:34 +, you wrote: >Alas, it has become very hard to email an EXE file. The ISPs are on to all >the tricks.. Just stick it on one of the free file sharing sites or in your personal web space, with nothing pointing to it except the link you send the recipient(s).

Re: [time-nuts] 1937 Time Standard

Some good articles I have read several that you sent Tom. Its funny such great information if you just search on the right terms. But then I appreciate the fact that you sent great links. No guessing. More to go and read. Regards Paul WB8TSL On Sat, May 21, 2016 at 4:50 PM, Tom Van Baak

Re: [time-nuts] Looking for a Linux user with a Z3816/Z3815/HP5xxxx

Treat it like a virus. zip -e -P password supersecretstuff.zip supersecretstuff.exe It's more likely to get through. On Mon, May 23, 2016 at 7:22 PM, Mark Sims wrote: > Alas, it has become very hard to email an EXE file. The ISPs are on to all > the tricks... zipping

[time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Lady Heathe does have sidereal time support. Set the time zone name to LMST or GMST or LAST or GAST and you get sidereal times... ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Looking for Z3801 Power Supply Board

My Z3801 power supply board has given up the ghost. It had been working well apart from an occasional Error 230 causing it to go into Holdover for no good reason from time to time which may well be related of course. Does anyone have a good power supply from an otherwise dead unit which

Re: [time-nuts] Looking for Z3801 Power Supply Board

On 5/23/2016 3:54 PM, Dave M wrote: Dan, If you haven't already found the Z3801A page at http://www.realhamradio.com/GPS_Frequency_Standard.htm, you should read it thoroughly (in your case, especialy the section on the power supply). there is a good pictorial that shows locations of all the

[time-nuts] Looking for a Linux user with a Z3816/Z3815/HP5xxxx

Alas, it has become very hard to email an EXE file. The ISPs are on to all the tricks... zipping them, renaming them, etc no longer work. The net has become a real nanny about protecting people from potential malware, etc. Things like EXE files disguised as PDF file were/are a real threat

Re: [time-nuts] Looking for Z3801 Power Supply Board

Boy do I agree with Dave's comments. Even if the big block inverter is bad it can all be replaced. I have a small inverting supply in my unit to replace one leg. I think it was the -5V supply. Its been running for 7 plus years. Good luck Regards Paul WB8TSL On Mon, May 23, 2016 at 6:54 PM, Dave M

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Hi Well, *maybe* there is a 24 hour component in the GPS constellation :) Indeed a lot of stuff repeats at the 24 hour point. The ionosphere is a bit different at midnight than at noon. Bob > On May 23, 2016, at 6:43 PM, Skip Withrow wrote: > > Hello Nuts, > > I am

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Hi Skip, > Any help in understanding this behavior? Thanks in advance. Yes, GPS satellites do repeat every ~12 hours in orbit around the mass of the earth -- but -- you and the earth turns 180 degrees during those 12 hours. So you're no longer where you should be when the 1st repeat occurs.

Re: [time-nuts] Looking for a Linux user with a Z3816/Z3815/HP5xxxx

Hi The quick and zero cost solution if it’s a point to point send — use something like We Transfer. As long as you don’t go crazy on file size or sign up for their “pay for it” service, it works fine. Bob > On May 23, 2016, at 8:47 PM, David Holland >

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Hi Tom, IMHO in your point "2)" you should not mirror the -104 to +104, but add 180 degrees instead resulting in a final longitude of +76 after 12 hours. In all other respects I agree. Peter Am Dienstag, 24. Mai 2016 schrieb Tom Van Baak : > Hi Skip, > > > Any help in understanding this

Re: [time-nuts] Simple solution for disciplining OCXO with 1 PPS

Hi Ok, so how would you do a pure analog GPSDO? The GPS receiver and that side of it are what they are. I’ll assume that you have a 1 pps out of a module. Your OCXO needs to get to 1 Hz via dividers. You can do that with digital dividers or with a chain of regenerative dividers. One is a

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Hi Skip: The GPS orbit is 12 sidereal hours. It sure would be nice if LH supported that time frame. The ground track repeats for each satellite, so LH could also have a separate elevation mask for each of them. -- Have Fun, Brooke Clarke http://www.PRC68.com

Re: [time-nuts] Maser 0.7 nsec jumps solved

On Sun, May 22, 2016 at 11:15 PM, Jim Palfreyman wrote: As far as a remedy goes we are going to try a solid state relay that only > switches on at 0V in the AC waveform. This should slow the inrush current, > and hopefully the magnetic impulse. > If the load being switched

Re: [time-nuts] Looking for a Linux user with a Z3816/Z3815/HP5xxxx

Just put the file on a server somewhere and email the link... even drop box... It's a waste to send files through email anyway... wastes tons of bandwidth sending a file through an unnecessary number of interim steps... __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Thanks to Hal and Peter for catching my sign/180 degree error. This means Skip's nocturnal evil twin lives near the border of China / Tajikistan / Kyrgyzstan instead of Inner Mongolia. Here are the contrasting maps: https://www.google.com/maps/@39.68,-104.902,600782m/data=!3m1!1e3

[time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Hello Nuts, I am attaching a capture from Lady Heather of a 3-day run. You can see the temperature vary by 7C over each day. The TB is being run open loop and another GPSDO 10MHz input to the unit instead of the unit's oscillator. I expected the purple line to repeat every 12 hours based on

Re: [time-nuts] Looking for Z3801 Power Supply Board

Dan, If you haven't already found the Z3801A page at http://www.realhamradio.com/GPS_Frequency_Standard.htm, you should read it thoroughly (in your case, especialy the section on the power supply). there is a good pictorial that shows locations of all the power supply test points. Using that

Re: [time-nuts] Nuclear transition for time reference - Nature 5-May, 2016, vol 533

In message , David Wit ten writes: >Much is published that comes to naught; I do not have knowledge to judge. >But it seemed interesting to me. Anything involving U233 sources is "interesting"... -- Poul-Henning Kamp

Re: [time-nuts] Looking for a Linux user with a Z3816/Z3815/HP5xxxx

You can just remove the .exe extension on the file and have the recipient add it back on once the file is received. DaveD On 5/23/2016 1:42 PM, Mark Sims wrote: I have added some code to Lady Heather to talk to SCPI GPSDOs (also Motorola, Ublox, and NMEA) and am looking for a guinea pig to

Re: [time-nuts] Capturing a 1PPS signal with a Keysight 53230A

Hi, On 05/02/2016 08:12 PM, Tom Van Baak wrote: * DC * 50Ohm * Bandwidth filter enabled DC and 50R is ok. I would not use the filter; you want the fastest edge possible. You forgot to mention the most important setting of all - the trigger voltage. Check the signal at your inputs with a

Re: [time-nuts] Simple solution for disciplining OCXO with 1 PPS

On Sun, 22 May 2016 15:52:16 -0700, you wrote: >... > >The DAC is nothing more than 16 precision resisters each >one twice the value of the next one, each connected to one bit of the >register by a transistor switch. It will take beyond a heroic effort to get 16 bits of differential

Re: [time-nuts] Capturing a 1PPS signal with a Keysight 53230A

Hi guys, Thanks for all the guidance! I was ultimately able to make this work by applying various suggestions from the list. In the end I needed to offset the uBlox in order to get a good read and then fix this in post processing. I checked the pulse before and after making the offset, and

Re: [time-nuts] Maser 0.7 nsec jumps solved

In message , Jim Palfr eyman writes: >As far as a remedy goes we are going to try a solid state relay that only >switches on at 0V in the AC waveform. This should slow the inrush current, >and hopefully the magnetic

Re: [time-nuts] Simple solution for disciplining OCXO with 1 PPS

Hi Is a DAC in our out? I can (with some effort) build the entire computing engine needed for a GPSDO out of 7400 series logic. It’s actually easier than you might think. Since that’s “small scale logic” is it in bounds? To me at least, analog is just that, no gates, no 1’s no 0’s, just a

Re: [time-nuts] Simple solution for disciplining OCXO with 1 PPS

The grid current of most tubes (apart from electrometer tubes operated at low voltage) is much larger than most FETs (apart from very large area ones).. The other issue with tube grid currents is that zero current corresponds to a delicate balance between electon and ion currents so the grid