I think I need to go back to school and take all my EE courses over again. Balun and unun construction can be a black art. The last example also features two cores instead of a single core. (OCFD), which does needs a balun to work and is not symmetrical. Or neither of the of the coax conductors might be directly connected to the output, as in these examples: I've never seen something called "unun" where this wasn't true.įor a balun, the coax center conductor might be directly connected to one of the output terminals, as it is in your example. There seems to be a great deal of confusion or disagreement, or maybe just different ways of accomplishing similar goals.Īfter reading the replies here and looking at many more schematics, the only common feature I can find is that an unun always has the coax ground shield directly connected to one of the output terminals. I also realize this is a much more complicated topic than I'd first thought! With a handy fixing plate for the toroid, so no longer necessary for gluing. This BalUn is built around an FT240-43 ferrite ring cores. Power max 600 Watts PEP, with solid tensile stools, All stainless steel performed. Make sure to not twist the copper too much, because this might create strange effects in the transformer at a later point. Complete 1:9 UnUn DIY kit for long-wire antennas. The best high power (1KW) 4:1 BALUN 1 to 30 MHz I constructed was a dual 2.4 Inch 125 u core (2.40 OD. Then twist the material slightly over the first 15 cm to hold it together. The 125 u is equal to 850 u for 1 to 30 MHz 1:1 BALUNs. Thanks, this is helpful, but I realize now that my question overlooked the difference between voltage and current baluns, and wrongly assumed that all baluns/ununs have a single core. First, fold approximately 15 to 20 cm of the enamelled copper wire in half.
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