|To:||Jim Jones <firstname.lastname@example.org>|
|Subject:||Re: [TowerTalk] Re: Trees, Mountains, 15 degrees...|
|From:||Jim Lux <email@example.com>|
|Date:||Mon, 24 Jan 2005 17:34:46 -0800|
At 05:25 PM 1/24/2005, Jim Jones wrote:
At a distance of 2.5 miles (call it 12,500 ft) a 100 ft tower is one part in 125. One degree is about 1 part in 60 (small angle approximation of sin(theta)=theta), so the tower reduces the angle about half a degree.
HFTA, included with the ARRL Antenna Book in recent editions, can plot all this stuff out and give you a better "picture" of what's going on.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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