3_ANTENNA_REMOTE_SWITCHING

Published:2009/6/25 23:46:00 Author:May | From:SeekIC

Single RF feed line serves for feeding transmitter power to tower and selecting desired one of three an-tennas. With S1 at a, neither K1 nor K2 is energized. RF energy then passes through cable to antenna terminals a' and GND. In position b，positive half-waves from 12-VAC supply operate relay K1 through CP1 and CR3, so antenna b' is energized. With S1 at c, K2 is energized through CR4 and CR2 forfeeding c'.-U. H. Lam-mers, A Remote Antenna Switch, QST, Aug.1974, p 41-43.



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