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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.
tenna, let’s examine how to build a 9:1 unun for it, then explain the modification necessary for a 9:1 balun for a balanced target such as ladder-line. As mentioned in the title, this project is for a voltage unun, because the transformer attempts to balance its input and output voltages, regardless of presented impedances. It does so by
Antena TV a bezpłatna naziemna telewizja cyfrowa. Antena TV będzie nam potrzebna do odbioru bezpłatnej naziemnej telewizji cyfrowej. Poza nią powinniśmy oczywiście mieć telewizor z wbudowanym dekoderem DVB-T lub odbiornik z oddzielnym dekoderem.
Most unun designs use smaller ferrites, or actual toroids (not binocular), and thus need more turns. One turn is a full circuit in one hole of the binocular toroid, and then back out the other. So, in one, out one, tap, then in one, out one seven more times (if that makes any sense).
A balun is to deal with differential vs single-ended, and a unun is a fixed transformer. The tuner is only needed if the antenna system isn't matched (usually 50 ohm), if the antenna gives the right impedance, your setup is already complete.
Planując zakup anteny, powinieneś określić: rozmieszczenie i kierunkowość nadajnika TV względem miejsca odbioru, jego moc, konfigurację terenu między nadajnikiem a anteną, zabudowę (miasto, teren otwarty), zalesienie oraz wysokość, na której planujesz zawieszenie anteny.
