Reflected RF power and VSWR (Voltage Standing Wave Ratio) are two related concepts in amateur radio. This reflected power can cause damage to the source and reduce the efficiency of the system. VSWR is a measure of the degree of impedance mismatch and is defined as the ratio of the maximum voltage to the minimum voltage in a transmission line. A high VSWR indicates a greater degree of mismatch and therefore a higher level of reflected power. A low VSWR is desirable for optimal power transfer and system performance.
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