>
> Ed K4SB wrote:
> >
> > 3. Do some simple trig and discover where the touchdown angle is for
> > a take off angle of 8 degrees. That's the problem with one of my 80
> > meter antennas. At 8000 miles or more, it's a killer...into Eu, it's
> > worthless.
> >
>
> Well, at 8 degrees takeoff and an F2 layer height of 240 miles
> (which is about the highest it gets) my trig shows a one hop
> distance of 3415 miles.
>
>
>I suspect that you can't ignore the earth's curvature if you are talking
>thousands of miles. I could probably have done this in my head a few
>decades ago...
>
>Depends what Ed meant by "simple trig" I suppose...
>
>Derek AA5BT, G3NMX
>oo7@astro.as.utexas.edu
>
>
You also have to consider that you're not dealing with reflection, but
rather refraction in the ionosphere. Get an ionospheric ray-tracing program
and run it on that!
Zack W9SZ
|