I'm wondering what the consensus is with regard to the NBTV club standard and the issues of aspect ratio, frame size/shape, and the positioning of holes.
a) Given that a scan segment on the Nipkow disk is pie-shaped, the region over which a frame is scanned is actually trapezoidal, or keystone shaped, not rectangular.
The meaning of "aspect ratio" with respect to a rectangular frame is apparent enough. What is the meaning of "aspect ratio" as it applies to a trapezoid? Are we talking about the ratio of the outside vertical dimension to width, the inside dimension to width, or the the height of the trapezoid at its center with respect to width?
b) It seems to me that resolving question (a) is necessary because, without a definition of frame height, one cannot know the frame width. Without frame width, one cannot compute appropriate hole sizes (as 32 holes must fit within the width dimension.)
c) Speaking of holes, and assuming round holes...the easiest kind to make....I gather that there is benefit to planning for overlap between scanning holes in successive disk segments. Is there a rule of thumb for the amount of overlap? Given a fixed width, the amount of overlap has direct bearing on the horizontal positioning of hole-centers, and the maximum allowable hole size.
Your thoughts?
Pete
AC7ZL