RFI to nearby devices like TV sets and telephones.Pattern Distortion – caused by radiation from transmission line due to common mode current on transmission line.Generation of CM Current From an Antenna idĬommon Mode Current is generated on the transmission line because of imbalance of displacement currents (id) around center of dipole antenna. Why are common mode currents undesirable?.How are common mode currents generated?.BALUN is name of device that can be many things like a common mode choke, unbalance to balance transformer, and a step up or down transformer.Name suggest device converts between “Balance Unbalance”.Balun formed from BALance – UNbalance.Loss of power to antenna due to mismatch between coax and antenna. The above are due to “common mode currents” on the transmission line.The BALUN & Antenna Problems What is a BALUN? The Current BALUN The Voltage BALUN Why & How to use a BALUN? Selecting a BALUN VIRGIL LEENERTS WØINK ARRL Technical Specialist Email –
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