100Km and a 5W total system - can you say divergence?????? 5W lasers use
enormous amounts of current.

I'm trying to think about the dBm that this system would require in RF
too (might want to check http://ntiacsd.ntia.doc.gov/msam/APD) - I
think this is why there is a market for fibre.

Andrew

Mark Borgerson wrote:

In article <CEE0b.1579$br1.58132@news.uswest.net>, lsboogy@qwest.net
says...
I was guessing that the laser output would be well under 1 Watt. At
115KB, you ought to be able to work with just a few microwatts of
received power, so you'd have to pick the aperture of your receiving
telescope appropriately. In any case, it would not be an inexpensive
solution. I suspect that the cheapest solution might be to buy
two data-enabled cell phones and a couple of 2.5Watt wall warts! ;-)

(Any place up high enough to have 100km line of sight is likely to
be right next to a cell tower at least in the continental US.)


The variety of solutions proposed simply illustrates the lack of
definition in the original post.




Mark Borgerson

I'm not aware of the involved situation.
But there are areas, where the next cell tower
is dozends or even hundreds of miles away.
At some places it is called outback.

Rene

Mark Borgerson wrote: