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Remember, coax is an unbalanced feedline. An antenna is balanced. Any current that flows back along the shield of the coax from the feedpoint is caused by the imbalance that occurs when you attach the two together (unbalanced feeline to a balanced antenna). The goal of putting a balun or choke at the feedpoint is to correct this situation which also prevents the common mode current.

You see baluns most often used with wire antennas that have no matching system. Whether or not you need one when a matching system is employed is a different story. I certainly wouldn't buy one if i'm using a matching system, but I might make a coax balun just because it's easy to do and won't hurt anything.

Moleculo

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[QUOTE="Moleculo, post: 19227, member: 1"] Remember, coax is an unbalanced feedline. An antenna is balanced. Any current that flows back along the shield of the coax from the feedpoint is caused by the imbalance that occurs when you attach the two together (unbalanced feeline to a balanced antenna). The goal of putting a balun or choke at the feedpoint is to correct this situation which also prevents the common mode current. You see baluns most often used with wire antennas that have no matching system. Whether or not you need one when a matching system is employed is a different story. I certainly wouldn't buy one if i'm using a matching system, but I might make a coax balun just because it's easy to do and won't hurt anything. Moleculo </p>[i][/i] [/QUOTE]

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