Hi David yes I think I have seen similar but not as low as that. If you
compare the suspension points the different vibrational mode should
obvious.....the suspension point is at a node. I think some of these are
quite difficult to excite, I have not seen any suggested circuits but I have
not looked too hard.
Alan
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I uploaded a couple of pictures taken with the 'phone.
http://www.satsignal.eu/Radio/2015-01-10-1700-54-crop.jpg
http://www.satsignal.eu/Radio/2015-01-10-1702-51-crop.jpg
The first photo shows the size and mounting points of the crystal. The
crystal itself appears to be a two-layer structure. The second photo shows
a detail of one of the mounting points. The gold plating appears to have
been scraped away at the edge, and some sort of solder join made at the
edge. I might be able to do a better image with a different camera, but I
don't know.
Hope that is of some interest.
David
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