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12 lut 2009 · Czy balun 91 z dipolem 2x19,5 m na 80 m pozwoli na strojenie na 40 m? Jakie wtyki do baluna są odpowiednie? Szukam informacji na temat budowy i zastosowania.
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AUTOR podał temat, "9:1 lub 1:9" jak kto woli, przepraszam,...
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Odcinek poświęcony tematyce radioteleskopów, a także...
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Here’s a nice homebrew project that would also suit constructors wanting to build a 9:1 Un-un [Unbalanced to Unbalanced] transformer. The heart of the Un-un uses a Type 43 [FT240-43] core and consists of a trifilar [3 wire] winding arrangement around the core.
14 kwi 2002 · My solution was simply to use some scotch tape every couple of inches to organize the cable. The scotch tape will disintegrate over time, but that's OK - the only purpose is to help you wind the wire around the core. Wind 9 turns around the core with the three wires.
These are sometimes known as a Magnetic Longwire Balun. Its really an impedance transformer (9:1) to feed a high impedance, end fed (unbalanced) random wire which is likely to be a few hundred ohms, and transform it into something closer to a 50Ω (unbalanced) coaxial input, hence UnUn.
31 sie 2017 · Building the popular 9:1 unun antenna based on the popular EARCHI antenna design. An antenna that works relatively well with an internal tuner for 40-6 meters. A popular antenna for portable ham radio operations or even multi - band operation at home.
Because this discussion focuses on the end-fed an-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.
I'm always fascinated by the "magic" 9/1 un-un for longwire antennas, also called "Magnetic Longwire Balun". You build this device, connect the transceiver and a longwire antenna of almost random wire, and GO!!!
