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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.
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. Figure 1 Typical 9:1 voltage unun and long wire antenna configuration.
With the 9:1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme impedances for all HF amateur band frequencies. This page is far from complete and represents the ongoing investigation into this type of antenna.
If you want to make one, look at Peter's video on TRX Bench on YouTube. Part 4 is about the 9:1 UnUn, but do yourself a favour, look at every one from the begining.. This is the choke and UnUn to go for.
12 sie 2016 · It’s relatively easy to build a 9:1 balun. One of the most common designs is to wind nine turns of a trifilar winding around a toroid core. Trifilar means that there are three wires wound simultaneously around the core.
Direction: Fold the 3 metres of copper insulated wire in two. Mark the wires’ end so to recognize them when the windings is done. Wind 13 to 19 turns of the bifilar wire ( more turns better response to lower band ). Connects the wire to the box terminal and the UHF connector ( SO 239 ) see the pics. READY.
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.
