[N] SWR meter [N]
james nolan (nolan_laboratories@email.msn.com)
Thu, 2 Sep 1999 15:35:56 -0600
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West Wight Potter Website at URL
http://www.lesbois.com/wwpotter/
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The SWR meter that checks the boat radio, cable and antenna measures the
standing wave ratio of the radio signal on the cable. The SWR is the ratio
of the maximum voltage to the minimum voltage of the standing voltage wave
on the cable. A high SWR causes the transmitter to heat up and decreases the
transmitted signal power. The maximum and minimum voltages occur at two
different places on the cable (related by the wavelength of the signal) and
yet the SWR meter needs only to be inserted in one place and that place
along the cable is not particular. How does the SWR meter know the peak and
minimum voltages on the cable since it may not be installed at either the
location of a peak or minimum?
Jim Nolan P-19, P-15, L138T, LGYC #6