Hi You pretty much have to assume that after 15 minutes or so the OCXO is right and the TCXO is wrong. You could play with this or that, but it's still going to be a leap of faith switch.
Bob On Dec 9, 2012, at 5:19 PM, shali...@gmail.com wrote: > If they don't get close, which is right? > > If you only have 2 references, you cannot tell which is right. > > Didier KO4BB > > Sent from my Droid Razr 4G LTE wireless tracker. > > > > -----Original Message----- > From: li...@lazygranch.com > To: Discussion of precise time and frequency measurement <time-nuts@febo.com> > Sent: Sun, 09 Dec 2012 4:04 PM > Subject: Re: [time-nuts] Switching oscillators > > You would probably want to see when the external oscillator frequency is > close to the internal oscillator. I suppose than could be done with a mixer > and glue circuitry. I don't think this is cheap though. > > > -----Original Message----- > From: Joseph Gray <jg...@zianet.com> > Sender: time-nuts-boun...@febo.com > Date: Sun, 9 Dec 2012 14:12:51 > To: Discussion of precise time and frequency measurement<time-nuts@febo.com> > Reply-To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Subject: [time-nuts] Switching oscillators > > I have a device that has an internal TCXO. I want to feed it with an > external OCXO, but I don't want to completely replace the TCXO. > > Here is the scenario. On initial power on, or after a power loss, I > want the internal TCXO to be used. Once the OCXO is up, I want to > switch to it. How could this be done easily and cheaply? > > Joe Gray > W5JG > > _______________________________________________ > 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. > _______________________________________________ > 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.
