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

[Pete Smith <n4zr@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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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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