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

To: "Pat Barthelow" <aa6eg@hotmail.com>, woods@grantspass.com,towertalk@contesting.com
Subject: Re: [TowerTalk] Trees, Mountains, 15 degrees...
From: Pete Smith <n4zr@contesting.com>
Date: Mon, 24 Jan 2005 14:28:09 -0500
List-post: <mailto:towertalk@contesting.com>
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" <woods@grantspass.com>
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


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