John: I have one of these and I really like the compact unit. I don't have any equipment to compare it's accuracy other than my Nortel GPSDO and watching them both on the scope. If you follow this thread there is a number of tips and commands on the use of the RS232 output. There is also a switch on the side that will give you a 10Mhz output if there is no antenna present. http://www.eevblog.com/forum/projects/a-look-at-my-symmetricom-gpsdo-(ocxo-furuno-receiver)/
-=Bryan=- > Date: Sun, 21 Feb 2016 11:55:59 -0600 > From: [email protected] > To: [email protected] > Subject: [time-nuts] Small Symmetricom GPSDO > > I have been playing with one of those small, 2.75"by 4.5" GPSDOs that are > being sold on that auction site. Most of the ones I have seen any > discussion about have been Trimble, but this Symmetricom one looks similar > but is about half price. I have hooked it up a few times to see how fast it > can find satellites and how the LEDs work. Yesterday, I hooked it up and > compared the 10 MHz output to my Z3801 which has been running for about a > month now. I am using my Racal 1992 counter in time difference mode. It has > a resolution of 1 ns. The 10 MHz isn't present until it has "locked"on > satellites. Or at least I presume that is it. I didn't get any 10 MHz for > about the first 10 minutes. At first, it looked pretty stable. Then, I > decided it wasn't. Now, I'm not sure. It acts differently to the Tbolt I > tested in the same manner before. While the Tbolt would sit steady on some > arbitrary time difference for maybe a half hour and then move 30 > nanoseconds or so in a minute only to settle down again for a while, this > thing just slowly drifts back and forth. After thinking about it, I think > that is how it was meant to operate. It seems to have been an internal > piece of some other, larger piece of equipment. In that role it was most > likely meant to provide either 1 PPS, 10 MHz, or both at pretty good > accuracy pretty quickly after getting power. It isn't as good as say a > Z3801, but then I don't think it was meant to be either. It certainly isn't > nearly as big. I may put it in a case with a power supply and a buffer amp > and use it for an everyday standard. I certainly think it is good enough > for that. It seems happy running on 6.3 volts at around 600 ma. after warm > up. Has anyone else had any experience with one of these? What did you > think of it? > _______________________________________________ > 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.
