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Well, as an update to my Carolina Windom project, I find that the CW OCF
dipole cut to typical dimensions works well WITHOUT a balun but does not work at all WITH a balun. Specifically, a DX Engineering BAL200-H10-AT 4:1 balun. I bought it to go with a folded dipole from DX Engineering. It worked fine with the folded dipole and a length 300 Ohm ladder line as feed. When I use the above balun with the CW cut to typical dimensions and using a 300 ohm ladderline feed, even RECEIVE is muted...no change from coax only. I am fairly sure that the balun is a voltage type and not a choke type. I also installed a series of ferrite beads from Palomar to choke the coax near the bottom of the ladderline. I guess I'm not all that surprised that the CW works without a balun...the ATU tunes it and sig reports aren't bad. I guess I have some radiation from coax and a mismatch from coax to ladderline but I think I can live with that. It's getting cold and I needed to finish this thing before winter really sets in. I am clueless as to why the CW failed to work AT ALL when USING a balun. The internals of the balun look fine. Any thoughts? (here goes) John AB8O |
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