[time-nuts] One Kg Quartz Resonator

Bob Camp lists at rtty.us
Wed Jan 23 12:39:13 UTC 2013


Hi

You want to mount the crystal at a point that is not moving (much) while the crystal is in resonance. For a normal AT, that's out at the edge. For most bar cuts, yes you mount it at a node. Without knowing the mode that the bar is resonating in, it's a bit hard to guess where the nodes will be. Just looking at the bar, you wouldn't *guess* that the end points would be nodes...

Bob

On Jan 23, 2013, at 5:07 AM, Fabio Eboli <fabioeb at quipo.it> wrote:

>> Hi
>> 
>> As with the one kg resonator, you need to mount the bar *somehow*.
>> The idea is generally to suspend the resonator at a point that
>> least affects the resonance (a dead spot). With a large bar, making
>> it manually adjustable is practical. Not so much with a smaller part.
>> 
>> Bob
> 
> Il 2013-01-23 01:54 jmfranke ha scritto:
>> I also have two of the crystals. The discs are used to adjust the
>> phase of the acoustic feedback to the resonator ends.
>> 
>> John  WA4WDL
> 
> Thanks Bob and John, I gave a superficial read to one of the patents,
> as I understand the patent says that the plates are there to give
> predictable acoustic reflections (yes I know I should read before posting questions :)  )
> Bob the dead spot mounting is interesting (are they called nodal points,
> or I'm mistaking terminology?).
> The metallization on the 50kc rod is on top and bottom plates, while
> the 100kc is "swapped", one electrode on top on one half and bottom
> on the other half rod. The suspension is also different, the
> 50kc is supended in the middle while the 100kc is suspended
> in two points. How are supposed to vibrate these bars? Will they inflect
> along the long axis? Or elongate? Or a mix of different motions?
> 
> Thanks.
> Fabio.
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