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about 100mhz upper limit

this is a mechanical vibration in a piece of quartz

sound travels about 1000ft a second

1 ft crystal is 1000 hz

1/8 inch 1Mhz

0.0002 in = 1Ghz

crystals in about 30Mhz are generally 3rd harmonic so perhaps .040 " is a practical limit ... experimenters have made them thinner but its usually a thin flat spot in the middle of a thicker piece

the crystal in your watch is of tuning fork variety held at the edge swings side to side so it doesnt need to be 3" thick

they settled on about 1/4" long and divide by 32768 in a ripple counter so you can see seconds

a meter long or so on the tuning fork crystal ought to give seconds directly

would be fine for a wall clock maybe

there is also a power limitation quartz breaks if bent beyond its elastic limit

has nice stability till then

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Q: What are the limitation of crystal oscillators and why?
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