Re: [amsat-bb] Eggbeaters ?

["Robert Bruninga" <bruninga@xxxxxxxx>]

Dave,
All satllites except for AO-40, spend 2/3rds of their
time below 20 degrees at any one observing station.
The amount of time above 50 degrees is less than
4% of the total time in view.   But when it is above
45 deg, it is almost 10 dB closer to you....  So you
dont need much gain there... 

See:  http://www.ew.usna.edu/~bruninga/rotator1.html
 de Wb4APR

>>> Dave Hartzell <hartzell@gmail.com> 12/03/05 11:34 PM >>>
Thanks all for the input....

Just one question, why is 15-degrees (or so) the magic number here  
for Yagis?   I have an Arrow, and if I mount that at 15 degrees, what  
happens when the spacecraft is overhead?  Maybe the beam-width of the  
Arrow is wide enough...

Dave

On Dec 3, 2005, at 6:07 PM, Edward R. Cole wrote:
>
> Instead I would go with a small yagi or the corner reflector  
> pointed up at
> 15-degrees (or so) and rotatable in azimuth.  If using linear  
> polarity it
> probably matters little if you chose Vertical or Horizontal so pick  
> what is
> easy to construct.
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