[time-nuts] Difference in manufacturing for fundamental tone, 3rd, and 5th overtone crystals

Bob Camp kb8tq at n1k.org
Fri Oct 28 08:03:53 EDT 2016


If you look at the mode shapes for the various overtones, their energy
maxima are at different locations on the blank. If you put an electrode on
top of the 3rd overtone energy pattern (and avoid the fundamental pattern)
you will boost the 3rd and reduce the fundamental. You can actually find
examples of this in production.

A more aggressive approach would be to “sort circuit” the fundamental energy 
so that the fundamental went down even further. While it can be done, I have
never seen a production example of doing this. 


> On Oct 27, 2016, at 11:31 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
> On 10/27/2016 4:50 PM, Bob Camp wrote:
>> Hi
>> Crystals are highly optimized for the specific overtone they are
>> intended to operate on. In fact, you can fiddle them to the point
>> that they no longer have a “fundamental” response.
>> Bob
> That's interesting.  Every overtone crystal I have played with
> would happily oscillate at the fundamental.  How do they
> get rid of the fundamental?
> Rick
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