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These are sometimes known as a Magnetic Longwire Balun. Its really an impedance transformer (9:1) to feed a high impedance, end fed (unbalanced) random wire which is likely to be a few hundred ohms, and transform it into something closer to a 50Ω (unbalanced) coaxial input, hence UnUn.
Step 1: Install radiating wire and counterpoise stubs. Cut the length of Poly Stealth wire roughly in half. Strip about ⅛” of insulation from the end of each wire. Insert one wire through the CPOISE strain relief hole from the bottom of the board, then into the solder pad on the top of the board.
Here’s a nice homebrew project that would also suit constructors wanting to build a 9:1 Un-un [Unbalanced to Unbalanced] transformer. The heart of the Un-un uses a Type 43 [FT240-43] core and consists of a trifilar [3 wire] winding arrangement around the core.
14 kwi 2002 · This last weekend I decided to roll my own 9:1 Unun for use with my Elecraft KX3 and whatever piece of wire I happen to have handy. This project is really simple and most of it was made using stuff I found in my junk drawer.
With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun is one possible solution.. Requiring a unun to feed a long wire antenna ideally without a tuner a 9:1 voltage unun design using a T200-2 Toroid core was selected.
31 sie 2017 · Building the popular 9:1 unun antenna based on the popular EARCHI antenna design. An antenna that works relatively well with an internal tuner for 40-6 meters. A popular antenna for portable ham radio operations or even multi - band operation at home.
24 wrz 2021 · Project: 9:1 UnUn Transformer. I really enjoy doing homebrew and DIY projects around the shack and I recently found a 9:1 UnUn kit on Amazon for pretty cheap. So I bought it and adventured into my first 9:1 UnUn transformer build.
