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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
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.
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.
31 gru 2022 · wyprowadzenie odczepów uzwojenia wtórnego dla wartości transformacji impedancji: 36:1, 49:1 i 64:1 (punktowe pokrycie szacowanego zakresu dopasowania), rozdzielenie uzwojeń pierwotnego i wtórnego w obszarze masy/uziemienia umożliwiając tworzenie dowolnej konfiguracji przyszłej anteny,
27 mar 2024 · Since we have not seen a good, rigorous measurement of any 49:1 UnUn embedded in a 50-ohm system, I constructed a couple to accomplish that measurement by connecting them in series: 50-ohms to 2.7 kΩ and back to 50-ohms.
22 lut 2021 · The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. You will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an antenna radiator for whichever ham band you choose.
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 ).
