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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 amateur bands from 80 meters thru 10 meters with a 135 foot length of wire and a short connection to ground.
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.
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,
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.
Any SWR measurement taken with the transformer at the feedpoint should not exceed 1.5:1 with NO tuner in use. There are numerous configurations available online that will accomplish this on multiple bands (Google search "end fed half wave antennas").
4 sie 2020 · 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).
Mini 49:1 UNUN The EndFed Half Wave Antenna is very popular antenna due to the very simple installation and handy design which can achieve many HAM bands without or with the tuner.
