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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.
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.
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.
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.
I'm always fascinated by the "magic" 9/1 un-un for longwire antennas, also called "Magnetic Longwire Balun". You build this device, connect the transceiver and a longwire antenna of almost random wire, and GO!!!
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.
This video discusses End Fed antennas and particularly End Fed Random Wire antennas for ham radio. Additionally, we go through the process of building a 9:1...
