If you're talking about common mode currents in a low gain receive antenna like a Pennant, K9AY loop, EWE, etc., common mode currents are of great concern because any signal picked up by the coax is very significant compared to the desired signal picked up by the antenna.
Common mode currents are of much less concern on a transmit antenna such as a coax-fed dipole or inverted vee, where the received signal (and noise) is much stronger. For the above-mentioned receive antennas, a choke balun is the easiest way to combat common mode currents. It can be made by coiling up the last 38' of coax at the antenna feedpoint into 12 turns, 12 inches in diameter. For transmit antennas, the same method may be used, or a 1:1 balun may be installed at the feedpoint. 73, de Earl, K6SE _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
