Hi I would guess that a fairly simple TCXO / fast lock GPS combo would get you pretty close.
Bob On Jul 14, 2010, at 12:13 PM, jimlux wrote: > Luis Cupido wrote: >> Jim, >> The implementation I've done on "reflock II" >> (on a MAXII CPLD form Altera >> http://www.qsl.net/ct1dmk/reflock.html ) >> Had fast aqs time in mind(*). >> It captures in few 1pps pulses >> and could stabilize to about 1% of dac range >> in quite less then 60s. >> How slower you need it to be in addition to the >> above timings depends on how much you want to average >> the 1pps. Having it fast it would obviously >> track the 1pps jitter. >> 'how good you need' -> 'how slow it has to be' >> These timings are off course after your GPS starts >> producing good enough 1pps pulses. >> Luis Cupido. >> CT1DMK. >> P.S. Super cheap approach is the reflockI >> (on a $5 CPLD) for which I made also a 1pps code. >> (but a few less specs and addons than II) >> (*) uW Radio ham application where you arrive on the top >> of the hill and switch all equipment on and can be making >> contacts minutes after having better than 1e-8(1e-9). >> > > that's precisely the sort of application I'm looking at.. > > Wheels stopped to on-the-air in <20 minutes. > > _______________________________________________ > 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.
