Here's even more fun. Do the OXCO ovens use a proportional servo or bang-bang? In the either case, the thermal time constant is very important, perhaps more so for the latter. Don
----- Original Message ----- From: <gandal...@aol.com> To: <time-nuts@febo.com> Sent: Thursday, February 05, 2009 12:25 PM Subject: Re: [time-nuts] Tbolt temperature sensor > > In a message dated 05/02/2009 18:44:44 GMT Standard Time, > hol...@hotmail.com > writes: > > The whole purpose of a GPSDO with an expensive double oven OCXO is to > provide extremely high quality holdover performance when GPS signals go > away. To > achieve this level of performance one needs to compensate for the affects > of > temperature on the parts of the system outside the oven. 0.5C resolution > is > not up to the task of maintaining parts per trillion accuracy. There > does > not appear to be any other temperature sensor in the Tbolt > > > --------------- > I'm still not convinced. > > There's going to be another very important temperature sensor inside the > Thunderbolt and that's the one inside the ovens, perhaps even two in a > double > oven. > > I understand where you're coming from but, given the apparent lack of > evidence to support the sudden deterioration in performance your findings > would > suggest, does it not seem more likely that in fact this sensor is not > involved > in the conditioning process? > > regards > > Nigel > GM8PZR > _______________________________________________ > 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.
