I was thinking the same thing and its power consumption's quite low. Will also guess may be easy to drive from a 12 V battery. Though I have not hilltopped and many years. I used to. Regards Paul WB8TSL
On Sat, Apr 5, 2014 at 9:10 PM, Dave Brown <[email protected]> wrote: > Sounds like an ideal reference for a microwave hilltopping event. > DaveB, NZ > (ZL3FJ) > ----- Original Message ----- From: <[email protected]> > To: <[email protected]> > Sent: Sunday, April 06, 2014 6:19 AM > Subject: Re: [time-nuts] new GPSDO kit > > > Hello Brooke, >> >> Can you say more about what this means? >>>> "It generates a low-noise 10MHz signal with typically better than >>>> 1E-010 precision and accuracy (0.1ppb) on average" >>>> >>> >> let me explain. I took some measurements over night, see attached files. >> This was done with the unit shielded from airflow and sitting on a bench, >> and >> the time constant increased by a bit to account for the benign no-airflow >> environment. >> >> You can see that the ADEV at any time from 1s to 10,000s averages and >> beyond is about 1.3E-010 worst case. So you can assume that the average >> accuracy (because of GPS being the absolute reference) and relative >> precision (the >> ADEV around the average value) is about 1.xE-010 on a typical unit. >> >> Also note that the second plot shows a standard deviation of the TI >> interval of 13.3ns which is significantly better than the 25ns spec. >> >> Lastly, the performance of 3E-012 at 10,000s is almost 3x better than >> spec. >> >> This was a random unit I grabbed that had been sitting on a shelf for some >> months, and I only let it run for ~15 minutes after power-on before I >> started the measurement. >> >> This is one of the beautiful features of the TCXO we use: it does not >> require long retrace and warmup periods. It runs pretty much right out of >> the >> box, even after months in storage. An OCXO based unit probably would have >> required 8+ hours to stabilize from its retrace after such a long >> off-period. >> In fact this unit ran at only about 1.5ppb error before disciplining >> started, meaning the TCXO and our firmware kept that frequency accuracy >> over >> several months on the shelf without power. >> >> So you could go to a work-site, set up the unit and wait about 15 minutes, >> then get a really clean, accurate, and stable reference signal. >> >> Hope that makes sense, >> Said >> >> >> >> >> In a message dated 4/4/2014 16:40:45 Pacific Daylight Time, >> [email protected] writes: >> >> Hi Said: >> >> Can you say more about what this means? >> "It generates a low-noise 10MHz signal with typically better than 1E-010 >> precision and accuracy (0.1ppb) on average" >> >> Have Fun, >> >> Brooke Clarke >> http://www.PRC68.com >> http://www.end2partygovernment.com/2012Issues.html >> >> [email protected] wrote: >> >>> Hello everyone, >>> >>> sorry for the plug, but we just announced a new $568 complete GPSDO >>> reference kit. >>> >>> This unit is a tiny desktop unit with 10m antenna, power supply, cables, >>> CD, and other accessories. It is a low cost addition to our Fury GPSDO >>> >> line, >> >>> and contains a really good TCXO, a uBlox GPS receiver, and various power >>> options. I believe this is the lowest-cost real GPSDO in mass production >>> available on the market right now, and being a true GPSDO it has some >>> >> fairly >> >>> good phase noise and stability specs. >>> >>> >>> http://www.jackson-labs.com/assets/uploads/main/LC-XO- >> Plus_PressRelease.pdf >> >>> >>> bye, >>> Said >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> >>> and follow the instructions there. >>> >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> > > ------------------------------------------------------------ > -------------------- > > > _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
