the ratio, along a transmission line, of a maximum to an adjacent minimum magnitude of a particular field component of a standing wave NOTE 1 - This ratio is equal to: (1 + r) / (1 — r) where r is the modulus of the amplitude reflection factor. NOTE 2 - The standing-wave ratio expressed as the reciprocal of the ratio defined above is occasionally...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=726-07-09
The standing wave ratio (SWR) is the ratio of power sent down a feed line from the transmitter to the power reflected back through the feed line to the transmitter. A ratio of 1:1 is considered ideal; anything higher than 2:1 usually indicates a problem in the impedance matching of the feed line or antenna.
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http://www.probertencyclopaedia.com/browse/GS.HTM
Standing Wave Ratio (SWR) compares the amplitude of a wave at its peak with the same wave at its null. It will optimally be a 1:1 ratio, though the measurement can be affected if the line is impeded
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http://www.used-line.com/glossaries/glossary.cfm?g_id=13
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