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Ground Or Not To Ground Receiving Antenna In Storm ?
"Robert11" wrote
is it better to just leave the now "floating" antenna alone, or is it better to ground one end of it ? ______________ Most MW broadcast stations use series-fed, insulated towers that usually are (by far) the highest structures in the area. These stations operate successfully in lightning storms using a combination of means. First is an arc gap connected across the tower feedpoint to a very low resistance earth ground (120 1/4-wave, buried radials). The gap is set to flash over at some margin above the peak voltage present during normal operation. They also use a "static drain choke" to earth ground, which is a high Z at the MW frequency, but doesn't let high static potentials develop on the tower. The last part of the protection system is supplied by transmitter circuitry that senses instantaneous phase changes in transmission line current, and kills r-f output for some milliseconds so as not to sustain any arc that occurs in the antenna system. Maybe some of these techniques could be useful in amateur radio installations. RF |
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