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Impedance is the measure of the opposition that a circuit presents to an alternating current when a voltage is applied. This is a force of much interest to the radio amateur especially surrounding the connection to antennas.

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High SWR on the transmitter means that less power gets radiated. Received SNR (signal to noise ratio) is degraded. High SWR on the receiver side means that both signal + noise reaching the antenna ar …
answered Nov 11 '14 by Juancho