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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.
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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.
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.
Building a 9:1 Un-Un for longwire antenna 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!!!
14 kwi 2002 · My solution was simply to use some scotch tape every couple of inches to organize the cable. The scotch tape will disintegrate over time, but that's OK - the only purpose is to help you wind the wire around the core. Wind 9 turns around the core with the three wires.
5 cze 2016 · Simple and inexpensive to build the 9:1 end fed long wire antenna is a good antenna for both portable and home use. This antenna, like all antennas, has it advantages and disadvantage. You’ll see...
Its really an impedance transformer (9:1) to feed a high impedance long wire (~450 ohm), down to a 50 ohm unbalanced coaxial input. I have heard them called an UnUn which seems more appropriate. I almost bought one of these for around £30, but then decided to make one.
