Hi Bob thanks for that. In replying to Atilla's query I did hope to trigger some responses that would update my knowedge as well. My experience of resonators is some 40 years old. Do you know if the older more massive blanks have a higher "Q" than these small bar ATs. All the high quality resonators I have come across have been relatively massive.
Alan --- On Tue, 13/3/12, Bob Camp <[email protected]> wrote: > From: Bob Camp <[email protected]> > Subject: Re: [time-nuts] quartz crystal configuration in small cases > To: "'Discussion of precise time and frequency measurement'" > <[email protected]> > Date: Tuesday, 13 March, 2012, 21:10 > Hi > > The typical AT low cost crystal is an AT strip. It's > rectangular rather than > circular. It still resonates across the thickness dimension, > just as the > circular part does. > > A modern 32 KHz crystal is set up as a tuning fork. > The resonance happens > each "arm" along it's length. Long ago 32 KHz crystals were > made as strips > that resonated along the length of the strip. A part that > resonates along > it's length is often called a bar in the literature. > > Bob > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] > On > Behalf Of ALAN MELIA > Sent: Tuesday, March 13, 2012 4:47 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] quartz crystal configuration in > small cases > > hi Magnus the only "bar" resonators I have actually seen > were NT flexural > bar. Modern cuts probably include all sorts of resonator > modes....but are > these AT cuts? > > Alan > > --- On Tue, 13/3/12, Magnus Danielson <[email protected]> > wrote: > > > From: Magnus Danielson <[email protected]> > > Subject: Re: [time-nuts] quartz crystal configuration > in small cases > > To: [email protected] > > Date: Tuesday, 13 March, 2012, 17:59 > > On 03/13/2012 06:35 PM, ALAN MELIA > > wrote: > > > Hi Atilla, I dont have book availabe but AT cut is > a > > thickness-shear vibration mode so plate area may not be > an > > issue ?? Just harder to make :-)) > > > > One of the AT cut oscillators I use has a crystal bar > rather > > than a circular plate. Being mass-produced in bulk, > etched > > etc. It is just a different process. > > > > I'm sure the crystal oscillator folks here could point > to > > some good sources on that. > > > > Cheers, > > Magnus > > > > _______________________________________________ > > 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. > > > _______________________________________________ > 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.
