File:2008 11 09 bos-sfo 093 (3022107724).jpg
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| Description | The three-tower transmitter of KGO/810am, which has been the Bay Area's most popular radio station for more than half a century. KGO's three towers alongside the causeway at the east end of the Dumbarton Bridge, are perfectly sited for AM radio, which travels best over the most conductive ground. There is no more conductive ground than salt water, and salt ponds like this one are the saltiest water and land on Earth. KGO transmits with 50,000 watts from towers 1/4 wavelength high, or about 250 feet. The three towers radiate <a href="http://www.fccinfo.com/CMDProEngine.php?sCurrentService=AM&tabSearchType=Appl&sAppIDNumber=249372&sHours=U">a directional pattern with two large lobes</a>, one to NNW, toward San Francisco and the other to the SSE toward San Jose. At night the signal reaches the whole West Coast by bouncing off the ionosphere. Its nulls between the lobes have the effect of minimizing signal toward the WSW, where there are unpopulated areas beyond the adjacent Bay Area (which still gets a good-enough signal), and toward the ENE, toward Schenectady, New York, where KGO protects WGY there — or did when the rules were created, back in the 1930s, and "clear channel" stations were protected at night. KGO by day covers a <a href="http://radio-locator.com/cgi-bin/pat?call=KGO&service=AM&status=L&hours=D">large part of California</a> with fringe reception stretching from Eureka in the North nearly to Santa Barbara in the South. |
| Date | |
| Source | 2008_11_09_bos-sfo_093 |
| Author | Doc Searls from Santa Barbara, USA |
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
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This image was originally posted to Flickr by dsearls at https://flickr.com/photos/52614599@N00/3022107724. It was reviewed on 14 May 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
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| current | 19:14, 14 May 2020 | | 3,264 × 2,448 (6.1 MB) | Evrik (talk | contribs) | Transferred from Flickr via #flickr2commons |
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