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## Re: [TowerTalk] Trees, Mountains, 15 degrees...

 To: "Pat Barthelow" , woods@grantspass.com,towertalk@contesting.com Re: [TowerTalk] Trees, Mountains, 15 degrees... Pete Smith Mon, 24 Jan 2005 14:28:09 -0500
 However, Jim did say "a few miles" away. HFTA, N6BV's terrain analysis software for the ARRL, only includes terrain out to about 3 miles in its calculations. The shape of the terrain obstruction can also make a substantial difference in how much impact it will have. All that being said, 15 degrees... wow. 73, Pete N4ZR 73, Pete N4ZRAt 02:16 PM 1/24/2005, Pat Barthelow wrote: SNIP: Jim Woods Said: From: "Jim & Velma Woods" Also, a few miles away is a mid-sized mountain which is east of my site. I used a topo map to determine that the top of the mountain forms an angle about 15 degrees above the horizon. Is this high enough to be a concern? Thanks for your input. Jim, W7PUP woods@grantspass.com Hi Jim, 15 degrees above the horizon is a very large vertical angle. I checked what 15 degrees means at 3 miles and computed an elevation difference of about 4000 feet, in 3 miles. Just to check the math, is your mountain to the east, 4000 feet higher than you are? If so...it will be a problem for low angle DX signals, as previously mentioned. 73, de Pat, AA6EG aa6eg@hotmail.com _______________________________________________ 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. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk _______________________________________________ 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. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk
 Current Thread [TowerTalk] Need advice on effects of trees, Jim & Velma Woods Re: [TowerTalk] Need advice on effects of trees, Michael Tope [TowerTalk] Trees, Mountains, 15 degrees..., Pat Barthelow Re: [TowerTalk] Trees, Mountains, 15 degrees..., Pete Smith <= Re: [TowerTalk] Trees, Mountains, 15 degrees..., Michael Tope Re: [TowerTalk] Trees, Mountains, 15 degrees..., Jim Lux Re: [TowerTalk] Trees, Mountains, 15 degrees..., Michael Tope Re: [TowerTalk] Trees, Mountains, 15 degrees..., Jim Lux Re: [TowerTalk] Trees, Mountains, 15 degrees..., Pete Smith Re: [TowerTalk] Trees, Mountains, 15 degrees..., Pete Smith [TowerTalk] Need advice on effects of trees, Jim Jarvis