lists at rtty.us
Thu Aug 30 21:15:20 UTC 2012
You can do the same thing with an AT as with an SC. They both exhibit the fundamental / third offset and tempo delta.
On Aug 30, 2012, at 5:10 PM, "Rick Karlquist" <richard at karlquist.com> wrote:
> Azelio Boriani wrote:
>> Interesting this third overtone/fundamental*3 idea but what makes the
>> overtone not equal to the fundamental*3? Is the crystal operated in series
>> or parallel resonance?
> That is where the special SC cut crystal comes into play.
> It's not so much that the 3rd OT is on a different frequency, but
> rather that it has a different and known tempco relative to the
> fundamental, so it can be used as a thermometer. It would be
> interesting to take a crystal out of a random 10811 and compare the
> frequencies of the fundamental and 3rd OT vs temperature to see
> if that crystal would accidentally make a good thermometer.
> Rick Karlquist N6RK
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