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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
31 gru 2022 · UN-UN 49:1 QRP – transformator impedancji anteny EFHW. Budowa anteny End Fed Half Wave (EFHW), czyli pólfalowego monopola zasilanego na jednym z jego końców, oferuje szereg zalet czyniąc tą konstrukcję bardzo atrakcyjną jeśli myśli się, na przykład, o pracy terenowej lub wielopasmowej z użyciem jednej 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.
4 lip 2023 · Live testing of this antenna here: https://www.youtube.com/live/NGsQ1ZRbYKI?feature=share
This is a followup video to #344 where I assembled the 49:1 UNUN kit from HF-Kits / ARRL. Here I show finalizing the antenna, getting it in the air, and run...
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The 49:1 impedance transformer ( or 64:1 ) will help you bring down the high impedance of your resonant EFHW antenna to almost 50 Ohm. Let’s have a look at a few details on how to build a 49:1, or a 64:1 impedance transformer.
