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Howard wrote:
Huh? If I'm mistaken, which could be, at least give me a hint why I'm wrong and I will follow up on it. Oh, ignore our professional idiot. You did miss something, however. The impedence mismatch makes the energy transfer from the antenna to the receiver to be inefficient. 5 dB is just about right for any 9:1 matching transformer (from an end-fed wire to a 50 ohm load). I'm not going to attempt to explain the theory behind it since I will certainly leave something out and the peanut gallery will come to life again, but think about SWR and reflected power and how bad the mismatch can be without the transformer vs. how bad it would be with the transformer. For a practiacal demonstration try (BRIEFLY) to feed a speaker from a tube amp without using a matching transformer. (You'll want a blocking capacitor, though.) I know this isn't rocket science as I work with rocket scientists and many know little about radio. :-) Until shown otherwise I stand by my statement that the balun will not add gain to the antenna - though it has other characteristics that will improve the received signal. No, no *gain* added to the antenna, but better power transfer to the radio from the antenna. 5 dB is what I've measured as well. I use ICE prepackaged transformers and Mini-Circuits transformers. Have a good one DX, Howard ps - I don't use a portable as my primary receiver 8-} -- Eric F. Richards "Nature abhors a vacuum tube." -- Myron Glass, often attributed to J. R. Pierce, Bell Labs, c. 1940 |
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