Figure_D-11_Long-wire_antenna_(FM_7-93_1995).gif
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Summary
| Description |
English:
Drawing of a "
long wire antenna
", a directional radio
antenna
used for communication in the
high frequency
(shortwave) bands, from a U.S. Army field manual. This is actually a type of antenna called a
Beverage antenna
. It consists of a random length of horizontal wire from 1-2 wavelengths long, terminated at one end by a resistor equal to the characteristic impedance of the antenna, about 600 ohms, with the receiver connected to the other end. The resistor is attached to a second parallel wire below the first, which functions as a
counterpoise
, an artificial "ground". It is a nonresonant antenna, and so is broadband, sensitive to a wide band of radio frequencies. The
main lobe
, its direction of greatest sensitivity, is to the right, parallel to the wire, off the end that has the resistor.
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| Date | |
| Source | Downloaded from U.S. Army Field Manual No. 7-93: Long Range Surveillance Unit Operations, Appendix D: Communications, fig. D-11 on [globalsecurity.org] website. |
| Author | U.S. Army |
Licensing
|
This file is a work of a
U.S. Army
soldier or employee, taken or made as part of that person's official duties. As a
work
of the
U.S. federal government
, it is in the
public domain
in the United States.
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