I should have posted the size I measured, it was about 2 - 3/4 inch
mean diameter.
Ratios traditionally are used to compare the same "units". If "d"
is in inches "s" must also be inches. Translated to turn to turn
spacing for 2-3/4 in diameter:
s/d ratio.5 = turn to turn distance approx 1-3/8 inch for Zo 1280
ohms Vp= .42
s/d ratio .75 = 2-1/8 spacing for Zo 1060 ohms Vp= .55
s/d ratio 1 = 2 -3/4 inch for Zo 930 ohms Vp= .63
73 Tom
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