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  1. vk6ysf.com › unun_9-19:1 VOLTAGE UNUN - VK6YSF

    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.

  2. m0ukd.com › homebrew › baluns-and-ununs9:1 Magnetic Longwire Balun / Unun – M0UKD – Amateur Radio Blog

    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.

  3. www.worldwidedx.com › threads › homebrew-9-1-unun-for-random-length-wire-antennasHomebrew 9:1 Unun for random length wire antennas

    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.

  4. q82.uk › 91unun-transformerAn End-Fed 160-10m Long Wire Antenna with a QRO 9:1 Un-un and 1:1...

    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.

  5. www.qsl.net › dk7zb › BalunsDK7ZB MTFT-Un-Un

    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.

  6. vk6ysf.com › longwire_antennaLONG WIRE ANTENNA - VK6YSF

    With the view to establish a quick and easy multi-band antenna for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution.

  7. www.kb6nu.com › playing-end-fed-wire-antennas-91-ununsPlaying with end-fed wire antennas and 9:1 ununs - KB6NU

    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.

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