Hi All I have just pulled out of redundant stock a Trimble 2102 Plus satellite navigation unit for an aircraft can this be used as a frequency standard at such as 1/5/10 Mhz
Paul B -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of Bob kb8tq Sent: 05 February 2019 19:12 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 <[email protected]> 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 <[email protected]> on behalf of Bob kb8tq <[email protected]> > 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 <[email protected]> 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 <[email protected]> on behalf of Bob kb8tq <[email protected]> >> 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 <[email protected]> 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 <[email protected]> on behalf of Grant Hodgson <[email protected]> >>> Sent: Monday, February 4, 2019 11:15 AM >>> To: [email protected] >>> 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" <[email protected]> >>>> To: "'Discussion of precise time and frequency measurement'" >>>> <[email protected]> >>>> 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 60 >>>> 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 -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
