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Efficiency of 200-ohm hairpin matching
"K7ITM" wrote in message ... On Apr 7, 8:36 am, "Antonio Vernucci" wrote: .................................................. .................. On the other hand, I'm surprised by the comment from the manufacturer about difficulties making a 1:1 balun. I have had good luck using ferrites and/or self-resonant coils of feedline and/or coils of feedline specifically resonated with additional capacitance. A 4:1 balun from a "hairpin" of 1/2 wave of coax, arranged symmetrically, is easy enough to make, but I would not rule out using a 1:1, if it has advantages for you. Cheers, Tom Also, I think the 4:1 , 1/2 wave would be a voltage balun. I am considering adding a ferrite 1:1 on the feedline side of the the coax balun. There is some feedline radiation right now. Tam/WB2TT |
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