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Notes on Building Antennas That Work The writer will endeavor to provide some examples of antennas that work well and explain in simple terms why. In simple terms, an antenna is a device for matching the RF energy applied to it to free space. Usually the energy is applied to the antenna by a transmission line. This device used to move energy to the antenna may be coaxial, (a wire on the same axis as a shielding tube or braid, (hence the term coaxial or on the same center axis. A balanced feed line
often consisting of two wires spaced apart evenly is popular and often called
ladder line. A third type used in microwave systems is wave guide This
finds very little use except for those amateurs who take microwave work
seriously and commercial work at UHF and above. AF4NB Dave Baker's Chickenfoot Antenna KC8ICI Semi Tractor Mirror Mounted Screwdriver Antenna W4KU Shanks 40 Meter Cage Antenna KB8TNI Bob Jenkins Screwdriver Motor Mobile Antenna The AE4QL Bill Hays Medium Wave RX Loop Aerial The KA8DDQ Jim Harvey Antenna Stretcher The KA8DDQ Jim Harvey Antenna Stretcher Coil Design Two ©2001 - 2006 All Rights Reserved Click Here To Send E-Mail To Dave Smith W8YZ - all comments are welcome |