Oh, and one other consideration-- your 802.11 most likely , (for the want
of a better word)
is "Omnidirectional" which is a lousey way to illuminate a dish!! A dish is
much happier when it
is illuminated with a beamwidth of say 60 degrees (for the sake of
arguement), any other power
outside that beamwidth isn't even hitting the dish (wasted energy, further
decreaseing the gain )!
Translation: if even a horn ,or a small yagi, ect. would make a much more
effecient feed than a
point source (radiating in ALL directions) You are starting with little
gain, and overlapping (wasteing
power) that is 2 strikes against you for directional gain!! Jim NN7K


I Sent:
Actually, (gain wise), as, from memory, double the SIZE, (or conversely),
Double the Frequency, you gain 6 dB! lets see: these for 18 GHz, , lose 6
dB, for 9 GHz,
Another 6, to 4.5 GIG, and another 6 to 2.25 GIG ! total, 18 dB loss!
Now, as to the dish, IF the round one, what was stated about getting the
feed centered is true,
HOWEVER, if you have the ELEPTCIAL dish, these are made to view 2
SATELITES!
and, even
Directv is useing them!! Reason?? Has to do with "OTHER" services, like
internet connects, and
LOCAL TV feeds!! In esscence, the dish is aimed between 2 sattelites,
allowing it to "see both
sattelites at the same time. This allows aprox 2-3 HUNDERD more (local )
channels to be direct
broadcast to your home (ABCBSNBCPBS) !! These are NOT very effecient
antennas at 2.4 GHz,
but, if you place your 802.11 feed, where the original feedpoint was for
18
GHz, most likely will be
at the most effecient point. Also, buried in the RECIEVERS for satelite
Recievers, they have
aiming instructions for these dishs, by zip code, and you will note the
different pointing instructions
for them, both round and eliptical!! Hope this helps, Jim NN7K