Hi Well, there goes Barkhausen …. :)
https://en.wikipedia.org/wiki/Barkhausen_stability_criterion <https://en.wikipedia.org/wiki/Barkhausen_stability_criterion> Bob > On Mar 1, 2020, at 8:58 PM, Alex Pummer <a...@pcscons.com> wrote: > > don't forget the oscillator is one amplifier with infinite gain on his own > frequency > 73 > KJ6UHN > Alex > > > On 3/1/2020 2:46 PM, Richard (Rick) Karlquist wrote: >> >> >> On 3/1/2020 2:28 PM, John Moran, Scawby Design wrote: >>> My apologies if this is slightly off-topic, but it does concern crystal >>> oscillators. >>> >>>> However, I then remembered Huygens's discovery that 1S pendulums mounted >>>> on the same wall, or beam, would synchronise and swing either in phase, or >>>> out of phase and sometimes one would be stopped, by the minute >>>> interactions. >>> >>> So, my question is - will my row of low frequency crystals 'talk' to each >>> other and synchronise in their frequency groups as well? Remember that >>> these crystals are long thin bars of quartz - one of the 3,600Hz crystals >>> being 2mm square by 60mm long - so they will possibly vibrate quite >>> vigorously compared w >> >> Injection locking requires that the oscillators be within each >> others 3 dB bandwidth, or at least close to that. Oscillators >> on different nominal frequencies are no problem (EG 3 MHz and >> 10 MHz). Even two "10 MHz" oscillators won't lock unless they >> are adjusted to close to zero beat. OTOH, if you carefully >> adjust a couple of HP10811's to zero beat, you will have to >> go to extraordinary measures to keep them from injection locking. >> A lot more than just running them on individual voltage >> regulators. >> >> Bottom line: probably not worth worrying about for your >> hobby project. >> >> Rick N6RK >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
