Would SAW oscillators be better than crystals? Joe
[EMAIL PROTECTED] wrote on 10/23/2008 07:01:31 PM: > Steve Rooke wrote: > > Hi, > > > > I believe it was pointed out earlier that the output of a LPRO uses > > some form of xtal oscillator as the output of the rubidium stage is > > quite noisy. Considering the general consensus is that xtal > > oscillators have these jumps, I wonder if the output of the rubidium > > stage could be just passed directly through a multi-stage xtal lattice > > filter to clean it up and use that directly and that may circumvent > > the xtal jumps people are seeing. > > > > 73 - steve > > > Steve > > The rubidium standard is passive it doesnt oscillate, it merely acts as > a high Q filter whose resonance can be probed with an external source. > Thus you need to replace the crystal oscillator with another low noise > source to interrogate the rubidium resonance. > > To be useful the bandpass filter would need a bandwidth of a few > milliHertz or less. > The crystals in the lattice filter will also experience similar jumps. > > Bruce > > _______________________________________________ > 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.
