Friday, February 18, 2011

Off-center-fed nonresonant sloper antenna


Nonresonant off-center-fed sloper (OCFS) antenna  consists of a wire radiator that must be
longer than 3λ/2 at the lowest frequency of operation. The feedpoint is elevated at least λ/4 above ground at the lowest operating frequency. The antenna is fed with 75-Ω coaxial cable. The shield of the coax is connected to a  λ/4 resonant radial (counterpoise ground). There should be at least one radial (more is better) per band of operation.

The far end of the radiator element is sloped to ground, where it is terminated in a 270-Ω noninductive resistor. The resistor should be able to dissipate up to one- third of the power level applied by the transmitter.

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