Re: The 7J20 Patent is now in the archives

Craig Sawyers <c.sawyers@...>

For all of you that are interested in the 7J20, Egge Siert just uploaded the entire US patent for
it. It
makes for interesting reading if you are interested in electro-optics, or in learning more about
unusual plugin.

Dennis Tillman W7PF
Indeed most interesting. Because the patent dropped off the perch in the early 90's the basic
principle is adopted by several manufacturers, chief of which is Ocean Optics who make them like
shelling peas. They use the same Czerny-Turner approach (Ocean's is actually a crossed Czerny Turner
for compactness), and up to date arrays from Hamamtsu. About $3k - $6k , powered from USB and
complete with spectral analysis software.

But in 1973, and typical for Tek, it was decades ahead of the curve.


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