Chris, That is a big no ! What the Thunderbolt is doing is adjusting the OCXO to keep it aligned with a known reference from the GPS system. The fact that a microprocessor is involved is from a totally different perspective.
A microprocessor controlled XO is a non oven crystal oscillator system that has additional computational control providing a bit more than just mere passive temperature compensation. The additional computational capability deals with having coefficients of that particular oscillator's behavior pre coded to compensate for the nonlinear behavior over a given temperature range. A microprocessor controlled XO system allows for using cheap crystals with minimum processing time and costs. Because of limited storage space there is no way for the system to have enough data to even try to compete with the quality of a decent OCXO. Beyond its initial calibration setup, it has no way of keeping it tied to a known reference, like the Thunderbolt is doing. Bill....WB6BNQ Chris Albertson wrote: > On Mon, Aug 27, 2012 at 7:33 PM, Jim Lux <[email protected]> wrote: > > > On 8/27/12 4:15 PM, Rick Karlquist wrote: > > > >> Several decades ago, the concept of the "smart clock" arose > >> at what was then HP. The idea was as discussed here to > >> "characterize" past aging, "predict" future aging, and > >> then "correct" the aging. > >> > > > We know what a OCXO is and a TCXO is. I was at a presentation at work a > whike back and they called what you describe a "MPCXO" or MicroProcessor > Compensated XO. They said the characteristics were between the OCXO and > TCXO > > Doesn't the thunderbolt do this. I think it watches the aging rate of the > OCXO and adjusts during hold over. > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > 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.
