Random wire antenna
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A random-length wire antenna is constructed from a number 12 or 14 AWG (1.6 to 2.0 mm diameter) wire of nearly any length, and is a type of wire antenna. Such an antenna can be used for transmitting on practically any frequency with a properly tuned matching network.[1]
Although random wire antennas can be made from any length of wire, one-half wavelength will provide poor results. [2][3]
The antenna is fed directly from output of the matching network or a tuned circuit, without a feed line. Since the antenna is located very close to the transmitter, RF feedback can be an issue. RF feedback can be minimized by selecting a wire length that causes the low feed-point impedance at a current loop to occur at the transmitter.[1]
The ground for a random wire antenna is chosen by experimentation. Grounds could be returned to the transmitter, a nearby cold water pipe or a wire that's approximately one-quarter wavelength long.[1]
[edit] References
- ^ a b c Straw, R. Dean (2003). The ARRL Antenna Book, 20th Edition. Newington, Connecticut, USA: The ARRL, Inc., 944. ISBN 0-87259-904-3.
- ^ The "Almost Random" Wire Antenna
- ^ Random length wire
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