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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.
DIY. Worthwhile projects you can build on your own. The inverted-L Rybakov 806 antenna. The what? I’ve been looking for a good inverted-L antenna design that I could build, and hap-pened upon this version, which seems to have not only operator testimonials but technical data to support them.
DIY. Worthwhile projects you can build on your own. 9:1 voltage unun. In a previous article, we discussed the end-fed antenna, and how it often exhibits a large im-pedance, anywhere from 1800 ohms to 5000 ohms. If your particular end-fed antenna exhibits. much lower impedance, like 450 ohms, or you’re attempting to match your 50-ohm coax to.
24 sty 2024 · An Unun, short for Unbalanced to Unbalanced, is a type of transformer used in RF antenna systems to match impedance between an unbalanced antenna and an unbalanced transmission line. It is designed to convert the impedance of the antenna to a value that is better suited for the transmission lines.
UnUn Transformator impedancji 100W 49:1 End Fed na płytce PL2. Postęp produkcji anteny będziesz mógł obserwować na bieżąco pod linkiem, który otrzymasz. Wszystkie anteny objęte są bezterminową opieką serwisową. Poza okresem gwarancyjnym liczona jest wyłącznie cena podzespołów, które wymagają naprawy.
12 sie 2016 · A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. So, if you connect a length of wire that presents an impedance of about 450 Ω to the input, you’ll get an impedance of about 50 Ω on the output. In fact, the 9:1 unun that I built is actually an autotransformer.
Utah Valley amateur Radio Club's Half Wave End Fed Antenna Detailed Build Instructions for the 80-10 end-fed half-wave antenna with 49:1 unun: Noji-Article-80-10-EF-HW.pdf
