Hi That’s an odd one. It is very unclear *where* that OCXO came from.
Bob > On Feb 5, 2019, at 7:16 PM, Richard Solomon <w1...@outlook.com> wrote: > > Here's a shot of what's inside those T-Bolts I bought. > (thanks to tvb for reducing the size of my original). > > Comments solicited ... > > 73, Dick, W1KSZ > > Sent from Outlook<http://aka.ms/weboutlook> > ________________________________ > From: time-nuts <time-nuts-boun...@lists.febo.com> on behalf of Bob kb8tq > <kb...@n1k.org> > Sent: Tuesday, February 5, 2019 12:11 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] 10 mhz accuracy for a satellite system > > Hi > > If the sticker on the OCXO (not the label on the outside of the box) has a > date code > in 2006, that should be fine. I’ve seen cases on … errr … various sites … > errr … > where the stuff inside the box did not match up very well with the labels on > the outside > of the box. No idea why …. > > Bob > >> On Feb 5, 2019, at 12:26 PM, Richard Solomon <w1...@outlook.com> wrote: >> >> The two I have are Trimbles with Red & Black Labels with White letters. >> It's marked D/C 0635, which if I assume is the Date Code puts them in >> 2006. >> >> 73, Dick, W1KSZ >> >> Sent from Outlook<http://aka.ms/weboutlook> >> ________________________________ >> From: time-nuts <time-nuts-boun...@lists.febo.com> on behalf of Bob kb8tq >> <kb...@n1k.org> >> Sent: Tuesday, February 5, 2019 8:32 AM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] 10 mhz accuracy for a satellite system >> >> Hi >> >> The parts we typically call TBolt’s were produced from about 1997 through >> about 2006. >> The date codes on the parts are one way to work out how far along the uint >> you have is >> in that sequence. There are other parts that Trimble produced (produces) >> under the same >> Thunderbolt brand. Those can be quite different beasts depending on which >> one you >> happen to be looking at. >> >> The early parts had OCXO’s labeled “PIEZO” on them. The later parts had a >> generic >> “TRIMBLE” label on them. The PIEZO labels have a date code stamped on them >> sort >> of randomly. The TRIMBLE labels have a field marked “date code”. In all >> cases I have seen >> it’s a two digit year followed by a two digit week. >> >> Anything with a PIEZO label is “early”. Anything from about 2003 on should >> be a pretty good >> OCXO. There are no guarantees, but that’s a pretty good guess. >> >> There are also changes in the temperature sensor IC and mods to the firmware >> along the >> way. The novel approach to a precision DAC and the resulting “noticeable” >> temperature >> coefficient seems to have been a constant through the entire production run. >> They also >> have various little spurs and noise bumps that some people get into cleaning >> up. >> >> The good news is that they all (from the first unit to the very last) run >> very well with LH. >> *That* more than any other factor makes them a really good choice. When >> tuned up, >> set up, and monitored with LH, they do much better than they would just >> running on their own. >> >> Bob >> >>> On Feb 5, 2019, at 9:23 AM, Richard Solomon <w1...@outlook.com> wrote: >>> >>> How does one tell the difference between "early" and "later" ? >>> >>> S/N, Rev # ?? >>> >>> 73, Dick, W1KSZ >>> >>> Sent from Outlook<http://aka.ms/weboutlook> >>> ________________________________ >>> From: time-nuts <time-nuts-boun...@lists.febo.com> on behalf of Bob kb8tq >>> <kb...@n1k.org> >>> Sent: Monday, February 4, 2019 7:23 PM >>> To: Discussion of precise time and frequency measurement >>> Subject: Re: [time-nuts] 10 mhz accuracy for a satellite system >>> >>> Hi >>> >>> One thing to watch on the TBolts - the ocxo’s used in them got better as the >>> years went by. An early one likely will not do quite as well as a later >>> one. They >>> also updated the firmware as time went by, same basic issue - later is >>> probably >>> better …. >>> >>> Bob >>> >>>> On Feb 4, 2019, at 8:51 PM, Richard Solomon <w1...@outlook.com> wrote: >>>> >>>> There have been some Trimble Thunderbolts over on that auction site >>>> that were being sold for $80 each (not surplus Telcom ones). >>>> I grabbed two and they work. >>>> >>>> My antenna was a "hockey puck" style antenna sitting on the window >>>> sash, facing South. >>>> >>>> 73, Dick, W1KSZ >>>> >>>> Sent from Outlook<http://aka.ms/weboutlook> >>>> ________________________________ >>>> From: time-nuts <time-nuts-boun...@lists.febo.com> on behalf of Grant >>>> Hodgson <gr...@ghengineering.co.uk> >>>> Sent: Monday, February 4, 2019 11:15 AM >>>> To: time-nuts@lists.febo.com >>>> Subject: Re: [time-nuts] 10 mhz accuracy for a satellite system >>>> >>>> Paul >>>> >>>> The keyword is GPSDO - GPS disciplined oscillator. The vast majority of >>>> these will give a 10MHz output. The long term accuracy is the same as >>>> the GPS navigation system, which for most purposes is similar to that of >>>> national standards. GPSDOs are more stable than most rubidium standards >>>> in the long term, and GPSDOs are extremely common in most laboratories. >>>> >>>> The Trimble Thunderbolt is very common and available on the surplus >>>> market, as is the HP Z3801A. James Miller (G3RUH) used to sell an >>>> excellent GPSDO. There are other home-brew designs available if you >>>> want to build. These have all been extensively characterised if you >>>> want the details. >>>> >>>> If you want to buy new, then there are products such as the Fury and >>>> Firefly from Jackson Labs; , U-Blox have many offerings (not sure if >>>> they do a GPSDO though). >>>> >>>> Google GPSDO or GPS frequency standard, or check the leapsecond.com >>>> website for more information - there's loads out there, it's just a case >>>> of using the right term in the search engine. >>>> >>>> regards >>>> Grant >>>> >>>>> Date: Sun, 3 Feb 2019 23:43:10 -0000 >>>>> From: "Paul Bicknell" <p...@bicknells.f2s.com> >>>>> To: "'Discussion of precise time and frequency measurement'" >>>>> <time-nuts@lists.febo.com> >>>>> Subject: [time-nuts] 10 mhz accuracy for a satellite system >>>>> Message-ID: <D1F28D64EDD440EC834753538090F381@precision380> >>>>> Content-Type: text/plain; charset="iso-8859-1" >>>>> >>>>> >>>>> Dear all >>>>> I currently use a 198 Khz off air standard but I can no longer use 600 >>>>> khz >>>>> since it moved from Rugby >>>>> I have herd a lot about varies frequency references that use satellites >>>>> This technology has improved immensely & become more affordable over the >>>>> past 5 years >>>>> >>>>> So can a standard locked to a satellite be as good as a Rubidium ? >>>>> >>>>> What accuracy can I achieve for a satellite system below ?800 as I am not >>>>> familiar with the latest that are on offer? >>>>> >>>>> Regards Paul Bicknell South Coast UK >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>> To unsubscribe, go to >>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>> and follow the instructions there. >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>> To unsubscribe, go to >>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>> and follow the instructions there. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > <IMG_0987-1200x800.jpg>_______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.