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Construction Details 49:1 Un-Un For End-Fed Resonant …

Construction Details 49:1 Un-Un For End-Fed Resonant HalfWave Antenna by Gordon Gibby Version Nov 13 2020 (added exploded photo of the jack installation). Version Nov 20 2020 (added 200 pf input capacitor to reduce SWR). This project assembles a 49:1 ferrite-core ( FT ) type #43 transformer that matches 50 ohm input to 2500 ohm end fed antenna. It is optimized for MHz but will work reasonably well on all amateur bands from 80 meters thru 10 meters with a 135 foot length of wire and a short connection to ground. (Adjustments to the length for your particular installation can move the resonance point to your preference). Additional suggestions for improvements are provided as well. ALL ANTENNAS ARE. COMPROMISES. You adjust in your own particular setting for your needs! 1. your kit should arrive with these parts Note for Project Coordinator: Complete these tasks prior to the day on Construction Blue plastic electrical box, pre-drilled for two jack connectors and one SO-239 1.

2. At the end that will connect to the Balun, pass approximately 1-1/2 foot through holes at one end of an insulator and tie with a couple throws of a knot. Strip off about 1/4” of insulation and then Crimp and then solder one of the crimp terminals on the free end. This will connect to the RED terminal output of your Balun. 3.

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