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N3JIM Twin Lead Antenna

N3JIM's Twinlead Antenna

Last updated Mon, 30 May 2011

(work in progress) Documenting my first antenna project, a 2-meter "Slim JIM" made from 300 ohm TV twinlead.
Slim-JIM calculator (metric) -- I created an Excel spreadsheet, copied in the metric lengths (in mm) for each section, then entered the conversion formula in the next column:


Excel 2007 has a "fractional format", which I chose with quarter-inch precision.