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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.
12 lut 2009 · Czy jeśli wykonał bym balun 9:1 coś takiego jak na stronie http://www.m0ukd.com/Magnetic_Long_Wire_UnUn/index.php to czy po podpięciu 19,5 m z jednego ramienia stroiło by mi sie to na 40 m. Pytanie oczywiście teoretyczne, gdyż najpierw musze się zabrać do baluna, a czy mi to wyjdzie to się okaże.
With this Un-Un you can find out the best ratio. Here with a test resistor for proving the impedance. Switchable MTFT. Here a simpler Un-Un with fixed taps. The built-in-ATUs of TS-480, TS-590S and IC-7400 have no problem to tune this wire from 7-28 MHz in all bands.
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.
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.
12 sie 2016 · In many cases, the impedance can be transformed with the help of a 9:1 unun (unbalanced input to unbalanced output). See the figure at right. A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9.
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.
