Hi All the numbers I gave assume you are starting from a 3rd / 5th at 10 MHz.
Bob On Nov 2, 2013, at 1:30 AM, David McGaw <[email protected]> wrote: > This all seems to be forgetting that the crystals are usually operated at 3rd > or 5th harmonic. The crystal in a 10811A is 10 MHz/3rd overtone. A high > quality 5 MHz/5th overtone crystal is really a 1 MHz fundamental, a large > piece of quartz. Running at a harmonic greatly reduces the influence of the > package. > > David > > > On 11/2/13 1:07 AM, Bob Camp wrote: >> Hi >> >> The real answer is that nobody knows. The economics essentially make finding >> out very expensive. Q most certainly goes up, I don’t think anybody disputes >> that. The questions about flicker / ADEV all revolve around small blank >> parts with major edge sensitivity issues. They also probably were not >> running in a very good oven. Unless somebody with very deep pockets decides >> they need to find out, it’s going to be an un-answered question. >> >> Bob >> >> >> On Nov 1, 2013, at 11:41 PM, Richard (Rick) Karlquist >> <[email protected]> wrote: >> >>> >>> On 11/1/2013 8:28 PM, Bob Camp wrote: >>>> HI >>>> >>>> If you doubled the diameter of the blank each time you cut the frequency >>>> in half, all sorts of nice things might happen. If you start with a 1/2” >>>> blank in at 10 MHz that goes to 1” at 5 MHz and 2” at 2.5 MHz. Around 1 >>>> MHz you would get to a 5” blank. >>>> >>>> Good luck finding high grade quartz bars to cut 5” (or even 1”) blanks out >>>> of. You are going to have to go back to the autoclave fixtures at the very >>>> least. Since growth is (at best) linear you cost of quartz will scale with >>>> the size of the blank. I’d bet it scales a bit more than that if you want >>>> to keep the material at a high level of performance. >>> You've explained the excuses vendors give for not making full >>> size crystals. But the question is, given these realities, >>> does this reduce the theoretical advantage of the lower frequency >>> and by how much? >>> >>> Rick Karlquist N6RK >>> _______________________________________________ >>> 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.
