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Cell towers outside range of airline cruising altitude

Original Source Link: (May no longer be active)
   http://www.boeing.com/commercial/727family/product.html

http://www.boeing.com/commercial/727family/product.html
Cruising Altitude: 30,000 to 40,000 feet
1 miles = 5280 feet
Cruising Altitude: 5.68 miles to 7.576 miles


http://www.mobiledia.com/guides/page1.html
--- and ---
http://electronics.howstuffworks.com/cell-phone.htm

(information retrieved Nov 24, 2006)

"And a carrier's coverage is a network of cell sites, each with a tower and base station controller for a range of about 10 square miles."

Area of a circle = 3.14 * r * r
10 sq miles = 3.14 * r * r
r = 1.7846 miles



http://en.wikipedia.org/wiki/Cell_site
(information retrieved Nov 24, 2006)

"In practice, cell sites are grouped in areas of high population density, with the most potential users. Cell phone traffic through a single cell site is limited by the site's capacity (there is a finite number of calls that a site can handle at once), and this limitation is another factor affecting the spacing of cell sites. In suburban areas, sites are commonly spaced 2-3 km apart, and in dense urban areas, sites may be as close as 500-1000 meters apart."

"commonly spaced 2-3 km apart"
1 kilometers = 0.621371192 miles
1.24 to 1.864 miles range


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