"ånønÿmøu§" wrote in message
...
One way might be to in-case the coil in epoxy resin and saw it in half
and simply count the windings.

Well, yeah, if you don't mind destroying the coil.

I worked for a guy who paid quite a bit of money to buy a competitor's
filter so he could reverse engineer it and get his product to do the
same thing. So he took it to a friends of his, who happened to be a
dentist. He and the dentist put it on the X-Ray machine and took a
picture of it, and found that the potted filter was just a few pieces of
coax cut off at the right wavelength to eliminate the transmitter's
spurious outputs.

I could X-ray this, too; I don't want to destroy it. And it would be
extremely difficult to count the number of turns by your method if the
wire was 32 gauge or finer.