150 ohms at resonance you say thats 3:1 Thats a tuff one to find unless
Palomar Engineering or Amidon still making made to order specialty baluns. A
4:1 would be about 25% less effecient or power loss being radiated out. Been
years since I last ordered anything from them.
Maybe feed it with narrow space open feed line that is home brewed, to a low
loss tuners looks like it is easier to make it happen. A company use to sell
ladder line spaced about 1 1/2 inches using 1/8 inch plastic dowel type
spacers, and the spacers were about a foot apart or so. You do not want to use
the web type ladder line cause it has a much higher line loss.
Keep The Faith, Jim K9TF/WA9YSD
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