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[aprssig] APRS buoy - transmit power and antenna?

Jan T. Pharo la2bba at jpharo.net
Mon Sep 10 20:01:15 UTC 2007


"Richard Amirault" <ramirault at verizon.net>, Mon, 10 Sep 2007 15:23:06
-0400:

>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
Hvaler, Norway




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