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Richard Clark wrote:
Hi Roy, The complaint is: Wire 3 segment length too short. L = .01914 m; recommended min. = .07495 m. and so on for 800+ lines. Attempting to find the Src Data results in: Wires 3 and 10 contact improperly or are too close. Wires 3 and 11 parallel and contacting. Wire 3 end 2 contacts improperly or is too close to wire 12. and so on... However, on close examination Pilot Error The wire is too thick (I noticed this in modeling Tom's coil at the Corum calculator and hadn't done the correction yet in EZNEC). The geometry still complains, but it doesn't inhibit processing. Thanx anyway. Thanks for the additional info. EZNEC's checks are often not fully understood, so I'll briefly describe what they do. EZNEC provides two types of checks, segmentation (formerly called guideline) and geometry. The first is advisory and tells when segment lengths or segment length/wire diameter ratios are outside NEC recommendations. As I mentioned in an earlier posting, warnings about too-short segments can often be disregarded without significant consequence, and this warning is often seen when a helix is created. The geometry check looks for situations such as touching or overlapping wires which can cause serious calculation errors. It takes finite wire diameter into account, so sometimes the cause of a reported error requires a bit of thought to determine, as it did here. EZNEC won't do calculations if any geometry error is present because of the high probability of the result being erroneous. The geometry check was introduced in EZNEC v. 4.0; the segmentation check has been present for a much longer time. NEC-4 has a check similar to but less complete than EZNEC's geometry check, but no equivalent to the segmentation check. NEC-2 has neither. Roy Lewallen, W7EL |
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