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Calculate number of turns needed to produce a coil with given L
Avoid by-guess-and-by-golly use of turns-to-inductance calculators to determine number of turns to yield the inductance you need.
Using the inversion of Wheeler's formula for inductance of single-layer coils, calculates the number of turns required to produce a specified inductance. Specify desired inductance, coil radius, and winding pitch.
FreqLength is a simple wavelength calculator that takes a given frequency as input and spits out various wavelength values for that frequency (full wave, half wave, etc.)
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MLS6(BG9AMG's the Maidenhead's Locator System Calculator 6th) is a free calculator program, which can convert Maidenhead's Locator System Grid Square into a coordinate(Lat/Lon) and gernerate a GoogleEarth kml file, distri- buted under GPL.