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Feed-Line Irregularities

October 15th Fact-of-the-Day

Feed-line irregularities result wherever line constants change due to poor joints, bends in which the two sides of a balanced line are not symmetrical, proximities to other conductors, and similar causes. Each feed-line irregularity produces a reflected wave having a magnitude determined by the extent of the irregularity. The reflections cause resonances on the transmitter side of the irregularities, even if a feed-line is properly terminated at the antenna end. Feed-line irregularities should be avoided to the extent reasonably possible, because the resonances make the load impedance seen by a transmitter and other behaviors different than normally expected. ©2004 Martek International All rights reserved.

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