I currently use an HP5370B with a gpib interface to compare the 10 Mhz output of each unit to another reference, and process the time interval data to produce adev plots. My current reference is an fts 1050 and I'm confident it is beating it's typical adev spec of 1e-12 at 100 seconds.
Regards Mark S ------------------------------ On Fri, 30 Dec, 2011 6:11 AM EST Azelio Boriani wrote: >How can you tell that your GPSDO consistently beats the TBolt? > >On Fri, Dec 30, 2011 at 5:58 AM, Mark Spencer <mspencer12...@yahoo.ca>wrote: > >> Yes that is correct. I have one of the units made by James Miller G3RUH. >> I had hoped to build some something along these lines on my own, but the >> Jupiter gps modules I acquired didn't actually have a 10 kHz output. Also >> my comment re the adev is for the 10 MHz output. I've never looked at the >> one pps output. >> >> >> Sent from my iPad >> >> On 2011-12-29, at 8:45 PM, "Richard W. Solomon" <w1...@earthlink.net> >> wrote: >> >> > I think you are talking about the G3RUH/N1JEZ design. I have built three >> of them >> > and they work very well. >> > >> > 73 es HNY, Dick, W1KSZ >> > >> > >> > -----Original Message----- >> > From: Mark Spencer <mspencer12...@yahoo.ca> >> > Sent: Dec 29, 2011 9:24 PM >> > To: Discussion of precise time and frequency measurement < >> time-nuts@febo.com> >> > Subject: Re: [time-nuts] Thunderbolt? (re simple gpsdo.) >> > >> > One of the designs using the 10 kHz output from a Jupiter gps engine >> and a simple PLL to discipline an ocxo might be good starting point if >> suitable gps engines are still available. There won't be much to tweak but >> the performance could be quite good. >> > >> > My first gpsdo was a manufactured version of this concept and it >> consistently beats my thunder bolt from an adev perspective and there is >> nothing to tweak (: >> > >> > >> > >> > Sent from my iPad >> > >> > On 2011-12-29, at 6:35 PM, Chris Albertson <albertson.ch...@gmail.com> >> wrote: >> > >> >> The era of cheap Thunderbolts appears to be history. >> >> >> >> >> >> What is the simplest GPSDO you can build? There are many designs >> >> around but when the T-Bolts came out I think people lost interesting >> >> building. >> >> >> >> I think something very simple could work. If your local oscillator is >> >> at all decent it will not loose or gain full cycle in one second. So >> >> I think you only need to compare the phase of the oscillator and the >> >> PPS. Would an analog controller work? I do software all day every >> >> day at work so it would be fun to build an analog computer for a >> >> change. >> >> >> >> >> >> Chris Albertson >> >> Redondo Beach, California >> >> >> >> _______________________________________________ >> >> time-nuts mailing list -- time-nuts@febo.com >> >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> >> and follow the instructions there. >> > >> > _______________________________________________ >> > time-nuts mailing list -- time-nuts@febo.com >> > To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> > >> > >> > _______________________________________________ >> > time-nuts mailing list -- time-nuts@febo.com >> > To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
