Hi Every paper I have ever read on the intrinsic Q of quartz makes the claim that Q * F is a constant ( Q goes up as frequency goes down). Unless blank diameter gets in the way, this has been true for any crystals I have ever used. Q does change as overtone changes, but that is not related to the Q of the material. A given blank design may (or may not) be limited by the Q of the quartz at any specific frequency. That is a function of a lot of things. The material’s properties set a maximum Q you can achieve no matter how good your blank design is and how big the blank. Done properly, the best 5 MHz resonator you can do *will* have 2X the Q of the best 10 MHz resonator.
Bob > On Jun 25, 2016, at 7:52 PM, Attila Kinali <att...@kinali.ch> wrote: > > On Sat, 25 Jun 2016 02:48:04 -0700 > Bryan _ <bpl...@outlook.com> wrote: > >> Quartz Crystal motional movement... >> https://youtu.be/y-rCgumTn4Q > > Some additional info: > > The Q of a crystal decreases with frequency. For a given crystal slap > and production process, Q*f is almost constant, with a peak around 5 to 10MHz. > > The highest Q I remember seeing were BVA's that reached 2e6 to 3e6 @ 5MHz > > Attila Kinali > > -- > Malek's Law: > Any simple idea will be worded in the most complicated way. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.