SWR: Difference between revisions
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==What is SWR?== | ==What is SWR?== | ||
When there is a mismatch between the output impedance of a transmitter and input impedance of an antenna, some of the signal - in the form of a wave - is reflected back down the transmission line to the transmitter. Standing waved of electrical energy will "appear" in the transmission line. SWR is the ratio: | |||
amplitude (height) of the standing wave : amplitude of an adjacent node (central point on the wave form) | |||
[Vk4yeh_standing_wave.jpg | 500px] | |||
==How is SWR related to forward and reflected power?== | ==How is SWR related to forward and reflected power?== | ||
Revision as of 23:05, 21 August 2008
Related wiki pages Antennas, Gain, Propagation, Bands
Standing Wave Ratio - (SWR)
What is SWR?
When there is a mismatch between the output impedance of a transmitter and input impedance of an antenna, some of the signal - in the form of a wave - is reflected back down the transmission line to the transmitter. Standing waved of electrical energy will "appear" in the transmission line. SWR is the ratio:
amplitude (height) of the standing wave : amplitude of an adjacent node (central point on the wave form)
[Vk4yeh_standing_wave.jpg | 500px]
How is SWR calculated?
Online SWR calculator from VE3KL