Great Tom!
I'm glad you also caught the serious flaw in the method used! Too many
people rely on flawed measurements for critical information!
> ALL THE RIGHT ANGLES ?
>
> YES and NO !
>
> N6BV used 100 ft elevation for his 80, 40 and 20 meter models,
> and 60 ft elevation for 10 and 15 meters, at both ends of the path.
>
> Such elevations have pattern NULLS inside the range of angles
> the ionosphere will support. Of course his results show NO
> propagation at those angles because of the ANTENNA PATTERN.
>
> If one really wants to understand the IONOSPHERE, it is necessary
> to illuminate ALL angles equally, or use several different heights
> to check path loss at each angle that is supported between the
> two given locations.
..........and that would require a VERY tall tower even on ten meters!
73 Tom
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|