[time-nuts] Quartz Crystal Motional Movement
kb8tq at n1k.org
Sat Jun 25 21:30:30 EDT 2016
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.
> On Jun 25, 2016, at 7:52 PM, Attila Kinali <attila at kinali.ch> wrote:
> On Sat, 25 Jun 2016 02:48:04 -0700
> Bryan _ <bpl521 at outlook.com> wrote:
>> Quartz Crystal motional movement...
> 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.
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