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#3
January 14th 08, 04:04 PM
posted to rec.radio.amateur.antenna
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folding a dipole in half
Geoff Mendelson wrote:
"I think if I were to short both ends and center feed it, it would be an equivalent to a wid(er) 1/4 wavelength end fed antenna and will still need a counterpoise." No counterpoise needed. Its called a "folded quarter wave dipole". Its first resonance is due to its 1/2-wave circumference. Its input resistance is not 300 ohms but 600 ohms. Its gain is 0,5 dB less than the 1/2-wave dipole. This information is from "TV and Other Receiving Antennas" by Arnold B. Bailey. You might want to feed it with 450 ohm ladder line. Best regards, Richard H. Harrison. KB5WZI |
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