Originally Posted by
Cane Pole
I used the chart that Kosmo posted and made a few trig calculations on the down imaging and determined that the down imaging is a slice (beam) of an approximate 30 degree cone angle from 800khz and 60 degree cone angle slice for the 455khz. I know nothing of crystal designs, but I have seen them manufactured. Cone angles are relative to the point of signal strength measurement anyway. Remember? -3db, -10db. It is not a linear measurement, but logarithmic. Size and shape of crystal determine the frequency.
Since the specs reference slice of cones, then I would suspect parabola which I remember not of. Ask Pan Man. He is a mechanical engineer and maybe could explain it better. The manufacturer's still have the tooth under the pillow..
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