Hi With the PRS-10 you get that hump in the ADEV. I’m not saying that it’s the end of the world, but it really does bug me that it’s there ….
Bob > On Jul 20, 2021, at 10:03 PM, Dana Whitlow <[email protected]> wrote: > > Bert, remember that I need a very long locking loop time constant setting in > order to smooth out GPS noise, so in a sense the GPSDo is *almost* in a > holdover state anyway, all the time. > > Probably the smartest thing for me to do is to buy a spanking new PRS-10, > with the PPS locking feature present. Then I could just leave it locked to > GPS most all the time, but disconnect the PPS and let it go into holdover > on the rare occasions when I need a few hours of even better stability. > > Dana > > > On Tue, Jul 20, 2021 at 6:56 PM ew via time-nuts <[email protected]> > wrote: > >> There is a lot of misinformation out there. It is not the OCXO that >> changes, Bruce did extensive testing and I did some too. The Vectron is >> super, would like to know what is in it but do not want to open one. Once >> warmed up the stable OCXO temperature is a main contributor to the board >> temperature. Using a Dual Oven may give you a warm feeling but only adds 1 >> more Watt of stable heat to the board making the temperature change >> smaller. The OCXO is important during Hold Over and that is why it is >> there. The changes are the DAC which is updated once a second. Very >> temperature sensitive. Cheap. We have done the tests 10811, OSA 8600, FRK >> and M100. For fun did use a cheap small OCXO, no performance change. Was >> done in Juerg's temperature stable basement. See attached picture. >> >> Bert Kehren >> My experiences with the T'Bolt have not been entirely satisfactory. If I >> set the loop >> lime constant long enough to get a satisfying smoothing of the GPS noise (a >> few hundred >> seconds), then the thermal sensitivity of the VCXO on the T'Bolt rears its >> ugly head and >> I see a lot of my HVAC system cycling instead. The T'Bolt E supposedly has >> a double- >> oven XO, so I'd like to give that a try. But my wallet says "whoa"! >> >> According to Bodnar, his units do have some choices in the time constant >> setting. >> I've been considering ordering a Bodnar just for frequency agility, but >> have been >> holding off out of concern for the complications of dealing with a foreign >> supplier. >> >> Dana >> _______________________________________________ >> time-nuts mailing list -- [email protected] -- To unsubscribe send >> an email to [email protected] >> To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send an > email to [email protected] > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
