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This project assembles a 49:1 ferrite-core (“FT”) type #43 transformer that matches 50 ohm input to 2500 ohm end fed antenna. It is optimized for 3.5/7/10/14 MHz but will work reasonably well on all
EFHW | Experimental Multiband Antenna with 49:1 UnUn. I made my first multiband experimental version of the Multiband EFHW antenna with 49:1 UnUn transformer. In this first part I want to show you complete process of made this antenna.
An 80-10 end-fed half-wave antenna can be a very good performing part of an HF station. But its performance depends heavily on a well-designed and carefully constructed 49:1 unun, which matches the long wire impedance to within tuning range of operation. But the perfor-mance of an end-fed antenna is also very dependent on height above ground.
How to Build a UN-UN. 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 ).
7 lut 2024 · Along my journey on understanding radio, electronics, and in particular, the magic of baluns, ununs, and other transformers, I came across this helpful video on how to analyze a 49:1 unun with a NanoVNA. I replicated it with the the “Alleyway Antenna” transformer.
4 sie 2020 · End-Fed Half-Wave. This is the page on the End-Fed Half-Wave antenna with a 49:1 transformer. This is a multiband antenna without the need for any tuner (which is the best type of antenna).
The "9:1 UNUN" are for random length wire antennas fed at the end. 49:1 or other high ratio transformers are for resonant "cut to frequency" antennas like the traditional zepp/fuchs antenna.
