File:Figure D-11 Long-wire antenna (FM 7-93 1995).gif
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Figure_D-11_Long-wire_antenna_(FM_7-93_1995).gif (550 × 361 pixels, file size: 36 KB, MIME type: image/gif)
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[edit]DescriptionFigure D-11 Long-wire antenna (FM 7-93 1995).gif |
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. |
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 |
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[edit]Public domainPublic domainfalsefalse |
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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current | 16:04, 8 February 2010 | 550 × 361 (36 KB) | Cerebellum (talk | contribs) | == Summary == {{Information |Description={{en|1=Figure D-11 from [http://www.globalsecurity.org/military/library/policy/army/fm/7-93/Appd.htm#top U.S. Army Field Manual 79-3].}} |Source=http://www.globalsecurity.org/military/library/policy/army/fm/7-93/fi |
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