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

[Pete Smith]

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 at 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 at 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 at hotmail.com
>
>
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