Yeah, I thought about that. If your antenna has 20-dB gain, like my eme array has, it has a 3-dB beamwidth of 20-deg. So at elev. 20 I could transmit 10w and only have 5w on the horizon. Restricting my satellite operation above 20-deg. would be needed. If you ran 25w, you would be restricted to above 40-deg. But didn't someone say that most satellite passes are below 40-degrees? How many folks use eme arrays for satellites?
Now if you uplink on 5.7 GHz with a 3-foot dish then beamwidth is 4-deg. with 33-dB gain. Your EIRP is 5w x 2000 = 10 kw ...kind of shows the advantages of mw for space comm.
I know I have definitely gone off topic...but it gives one something to think about.
73 Ed
At 07:36 AM 4/24/2007, Margaret Leber wrote:
On 4/24/07, Edward Cole kl7uw@acsalaska.net wrote:
Build satellites that require no more than 5w EIRP from the ground station may be the only answer.
Or transmit with a more directional antenna aimed skyward...which is not a practical solution for terrestrial repeaters.
-- 73 de Maggie K3XS Editor, Phil-Mont Mobile Radio Club Blurb - http://www.phil-mont.org Elecraft K2 #1641 -- AOPA 925383 -- ARRL 39280
73, Ed - KL7UW ====================================== BP40IQ 50-MHz - 10-GHz www.kl7uw.com 144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w DUBUS Magazine USA Rep dubususa@hotmail.com ======================================