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A few further comments.
For perfectionists, the attenuation along a twin-line wound on a choke balun, is appreciably less than a coaxial line of about the same length. This is due to the lower Zo of the coax and also due to the very small inner coaxial conductor diameter and its higher loss resistance. This is not of great conseqence. The length of line involved is quite small anyway. Less than 1/8th wavelengths at the highest frequency of interest. The power-handling and voltage-handling ability of twin-line is also greater than coax line. So, in general, a choke balun wound with Radio Shack, 18 SWG speaker cable, is cheap, easier to construct, works better, and is more power efficient than the small-bore coax usually used. ---- Reg, G4FGQ |
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