With the price of T-Bolts now higher, does it make sense to build your own GPSDO?
What is the simplest phase detecter that could work? I think only that, and then a duouble oven crystal from eBay, a GPS and and Arduido. Yes the Aruino is expensive compared to a bare uP chip but using one, I thin you could build a GPSDO without a PCB and the Arduino's USB connection could be usful for power and logging/control. If ther phase detector where simple enough it could be build on a prototype board the fits on top of the Arduino. There are some other designs but because programming a uP and making a PCB seem to be rare skills that job tends to fall on one person. Anyone can program an Arduino and with out need of a PCB the entire design could be puted on a web page and the replicated with common parts. On Tue, Dec 4, 2012 at 4:01 PM, Bob Camp <li...@rtty.us> wrote: > Hi > > I would guess that HP/Agilent/Symmetricom and Trimble made 100X more > GPSDO's than the next five people in the business combined over the 1995 to > 2005 period. > > Bob > > On Dec 4, 2012, at 10:26 AM, paul swed <paulsw...@gmail.com> wrote: > > > Al > > I like the truetime products. In general easy to understand and last a > long > > time. > > But there never seemed to be that many. Sure they were used in > broadcasting > > and maybe power. But the others like the 3801 and tbolt were used in > telco > > and mobile apps so there were 10,000s turned out and thats why we get > them > > for cheap. I simply never see the truetime dc60 or gps units around. > Though > > I have my stock of dc468 sat clocks. :-) Working. I hacked a goes sat > > replacement 3-4 years ago. > > That said some of the older gps technology is a bit slippery on exactly > how > > good they are. > > So for perhaps amateur purposes they are totally fine but when you start > > comparing to a Tbolt or 3801 various behaviors apear. > > Odetics GPStars as an example slip cycles on purpose. Its a mode you can > > set and by default is how they are set. > > For what they were intended for they are perfect. But at least 1 X10 > poorer > > then other devices. Its not at all broken. It was a general time piece > for > > radio networks. Give or take 500 ms. > > Regards > > Paul > > WB8TSL > > > > > > On Tue, Dec 4, 2012 at 9:58 AM, Al Wolfe <alw.k...@gmail.com> wrote: > > > >> Most of the choices I've seen here mention the Tbolts, 3801, 3805, > etc, > >> but I have never seen anyone mention the TrueTime XL-AK. It advertises > 40 > >> nsec 1 pps. Frequency as 1 x 10-12 per day. I have one and it seems to > work > >> well but have no way to test it against anything else yet. It has four > each > >> 10 MHz sine output that I have been using for house sync for HP3586, > >> HP8924c, PTS160, etc. > >> > >> So how does the TrueTime compare to other GPSDO's? > >> > >> Al, K9SI > >> > >> ______________________________**_________________ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to https://www.febo.com/cgi-bin/** > >> mailman/listinfo/time-nuts< > 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. > -- 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.