End Fed Halfwave HF Antenna with Winder
thingiverse
This is a frame for an End Fed Halfwave Amateur Radio HF antenna with a built in antenna winder. The purpose of this is to convert a 50ohm feedline (coax) to approx 2000-3000ohms which will allow a halfwave piece of wire to transmit/receive on several amateur radio bands with 100W transmit power (please build and test for yourself, don't take my word for it!). Use a 10M piece of antenna wire for 20-15-10M coverage, and use a 20M piece of wire for 40-20-15-10M....trim wire to lowest SWR. For more instructions, google is your friend! Parts List: Type 43 61mm Ferrite Toroid, Mouser #623-5943003801 (Fair Rite 5943003801) 16AWG enameled copper wire (Amazon) 100pF >=3kv capacitor 1/4-20 screw (threads into center approx 1/4", does not pass through toroid) SO-239 RF connector Optional Parts List: 1/8" thick Lexan (clear) cut with 2-1/2" hole saw (cover for transformer)
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