Figure 8 on page 7 of H-P app note 200-2 (www.leapsecond.com/pdf/an200-2.pdf) gives an idea for how HC-49/U strap-type parts are built, just with a smaller blank than you mention. Not sure what's in SMT parts, but they have used rectangular beam and fork structures for lower frequencies, at least in the Statek and ECS parts I've seen. One of these days I'll have to cut one open.
Bob LaJeunesse ________________________________ From: Attila Kinali <[email protected]> To: [email protected] Sent: Tue, March 13, 2012 1:26:17 PM Subject: [time-nuts] quartz crystal configuration in small cases Hi, I have been reading up on quartz crystal oscillators in the past few weeks. Something that i couldn't figure out until now is what kind of configuration the small crystals use. If you read all those documents on quartz, they all show the oscillator "core" as a round plate, approximately 1.4cm diameter, one side, maybe both sides rounded (like [1]). That's all nice and good, but those crystalls fit only into the large cases. Even a HC-49/US has not enough space for such a plate. And the SMD cases are even worse. Unfortunately, my google skills failed me on finding any information on how the configuration of the crystal in those small cases look like and what oscillation modes they use. Would someone be so kind and give me a few pointers on this? Thanks in advance Attila Kinali [1] http://flaggedrevs.labs.wikimedia.org/wiki/File:InsideQuartzCrystal.jpg -- The trouble with you, Shev, is you don't say anything until you've saved up a whole truckload of damned heavy brick arguments and then you dump them all out and never look at the bleeding body mangled beneath the heap -- Tirin, The Dispossessed, U. Le Guin _______________________________________________ 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.
