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rradina

join:2000-08-08
Chesterfield, MO
reply to sleuth

Re: He's the boss...

The wider HD dishes might be easier to align but obstructions are still a problem. While there are lots of factors as to why obstructions are still a problem, two seem to be on the short list:

1) The transmitters are ~25,000 miles above the equator. In free space (the vacuum of space), an RF signal degrades by 1/4 every time the distance doubles. Since the distance is significant, the signal is not very strong by the time it reaches a base station.
2) They use very high frequencies (above 10Ghz). In general, higher frequencies do not penetrate obstructions as easily as lower frequencies.


cdru
Go Colts
Premium,MVM
join:2003-05-14
Fort Wayne, IN
kudos:7
said by rradina:

The wider HD dishes might be easier to align but obstructions are still a problem.

The width of the dish has less to do with ease of alignment (or otherwise increasing signal strength). It's with allowing multiple satellites in different orbital locations to reflect their signal to one or more focal points close to each other in front of the dish. If it was about ease of alignment, then keeping the big ugly dishes of yesteryear would have made things even easier to align.