File:WBT-Towers.jpg
Summary
Transmitter towers of AM radio station <a href="https://en.wikipedia.org/wiki/WBT_(AM)" class="extiw" title="w:WBT (AM)">WBT</a> just south of Uptown Charlotte, NC. These distinctive diamond-shaped towers were constructed in 1932 by the <a href="https://en.wikipedia.org/wiki/Blaw-Knox" class="extiw" title="w:Blaw-Knox">Blaw-Knox</a> Co. and are called <a href="https://en.wikipedia.org/wiki/Blaw-Knox_tower" class="extiw" title="w:Blaw-Knox tower">Blaw-Knox towers</a>. The purpose of the diamond-cantilever shape was to improve the horizontal radiation pattern to reduce fading, and also to make the tower rigid to shear stress so that it only needs one set of guy-lines, attached at its broad "waist". In the 1930s, multiple sets of guy lines, as are used on modern "thin" antennas, tended to interfere with the radiation pattern of the antenna.
Licensing
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:54, 3 January 2017 | | 1,090 × 1,537 (74 KB) | 127.0.0.1 (talk) | Transmitter towers of AM radio station <a href="https://en.wikipedia.org/wiki/WBT_(AM)" class="extiw" title="w:WBT (AM)">WBT</a> just south of Uptown Charlotte, NC. These distinctive diamond-shaped towers were constructed in 1932 by the <a href="https://en.wikipedia.org/wiki/Blaw-Knox" class="extiw" title="w:Blaw-Knox">Blaw-Knox</a> Co. and are called <a href="https://en.wikipedia.org/wiki/Blaw-Knox_tower" class="extiw" title="w:Blaw-Knox tower">Blaw-Knox towers</a>. The purpose of the diamond-cantilever shape was to improve the horizontal radiation pattern to reduce fading, and also to make the tower rigid to shear stress so that it only needs one set of guy-lines, attached at its broad "waist". In the 1930s, multiple sets of guy lines, as are used on modern "thin" antennas, tended to interfere with the radiation pattern of the antenna. |
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