[aprssig] APRS buoy - transmit power and antenna?
Jan T. Pharo
la2bba at jpharo.net
Mon Sep 10 15:01:15 CDT 2007
"Richard Amirault" <ramirault at verizon.net>, Mon, 10 Sep 2007 15:23:06
>No one seems to have noticed my comment on limited distance of line of sight
>due to curvature of the earth.
>See: http://www.naval.com/sight/index.htm to calculate the distance between
>two stations. The Great Lakes are pretty darn BIG. Frankly, I think you'd
>be darn lucky to get a signal to shore.
In eyeheight from a small craft (where you stand with the feet
approximately at sea level) we learnt in my boating course that I'd
have the horizon about 3 nautical miles away (and the web site
mentioned above tell me the same). It might be a good idea to build
the buoy so the antenna is as high above the water as possible, in
order to increase the distance to the horizon (and possibly reach a
digipeater on a tower ashore)
73 de Jan, LA2BBA
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