Yes, oscillators that are harmonically related can indeed injection lock. I've done it in a project about 40 years ago.
In your case, you need to avoid RF cross-coupling between the oscillators. This includes both electromagnetic coupling, "direct coupling" via use of a common power supply, and perhaps even "acoustic" coupling via physical vibrations coupled through whatever you have the crystals mounted on. But I'd think that more than half the fun of your project could be in finding out if there is a problem and in attempting to isolate the cause(s). Go for it! (and tell us what you learn). Dana On Sun, Mar 1, 2020 at 4:28 PM John Moran, Scawby Design < j...@scawbydesign.co.uk> wrote: > My apologies if this is slightly off-topic, but it does concern crystal > oscillators. > > I have a small collection of ancient crystals amassed over the past 50 > years or so. Half a dozen are low frequency (3,600Hz, 10kHz, and 100kHz), > long bar, crystals sealed into B7G vacuum tube bodies. I was considering > mounting them all in a neat row in a nice aluminium housing with individual > oscillator circuitry and LDO regulators to ensure that they were all > independent. For fun I will divide each oscillator down to 1PPS and use > that the flash individual LEDs in the face of the housing, and watch them > all slowly move in and out of phase with each other. > > 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 with squat discs. > > I look forward to your comments. > > John > _______________________________________________ > 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.
