You might consider the design by Lars Walenius posted and discussed at length here https://www.eevblog.com/forum/projects/lars-diy-gpsdo-with-arduino-and-1ns-resolution-tic/
I have built several GPSDOs based on this design, most recently incorporating a TDC7200 TDC chip for the time to digital conversion. The basic hardware design is very simple, but it provides good performance and a great learning platform. On Sat, Feb 19, 2022 at 7:10 PM Larry Gadallah <[email protected]> wrote: > After poring over the several valuable references people have posted > here, it seems that even the common commercial GPSDOs have > implementation problems, so it seems like there's no (financially > viable) off the shelf solution. > > It would indeed be convenient to have a kit option, but I'd image the > potential marked for a GPSDO kit is vanishingly small. > > FWIW, I started with a VE2ZAZ board and an Isotemp OCXO and a Motorola > receiver of questionable provenance. Since then I've gathered an HP > 10811D and I have an HP E1938A coming (I think), so I have only so far > gathered some essential components that I hope are competent. > > On Sat, 19 Feb 2022 at 07:13, Bob kb8tq <[email protected]> wrote: > > > > Hi > > > > Building a kit is very different than a from scratch design. A > > Heathkit (to extend the years ago ham radio analogy) radio > > was an option when you shopped for your Drake. Building it > > would give you some experience. > > > > The Heathkit *design* was done for you and all the complicated > > higher level stuff was worked out / tested out / reworked / retested > > by somebody else. As long as you put it together correctly, it > > worked and was a good radio. > > > > These days there aren’t a lot of folks selling kit GPSDO’s. Even > > the kit radio business isn’t what it once was. “I’m going to do > > a GPSDO” these days generally means a scratch design. > > > > Bob > > > > > On Feb 19, 2022, at 2:41 AM, Bill Beam <[email protected]> wrote: > > > > > > But there is a magazine article.... > > > <https://www.qsl.net/n9zia/wireless/QST_GPS.pdf> > > > By Brooks Shera, W5OJM. QST July, 1998. > > > > > > Following this article I built my unit in 1998 using his PCB and a > Motorola UT+. > > > It has been running almost continuously since then - almost 25 years. > > > It has been thru several HP 10811 and 10844 oscillators during that > time. > > > > > > Even though Brooks is SK his GPSDO is still running. > > > > > > Regards. > > > Bill, NL7F > > -- > Larry Gadallah, lgadallah AT gmail DOT com > PGP Sig: 4E5A 6A79 0A8D 2C0D 8D20 609D 3681 AA38 09C0 8303 > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send > an email to [email protected] > To unsubscribe, go to and follow the instructions there. -- --Jim Harman _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
