Google Interested in Wireless Bandwidth Balloons 181
An anonymous reader writes "Google is reportedly looking into investing in or buying a company called Space Data, which provides wireless voice and data services to remote areas with a fleet of weather balloons fitted with transceivers." My mind is sorta tripping over how something like this could work, but I gotta admit that the idea is really cool.
Re:Rural area (Score:5, Informative)
Helium Shortage (Score:4, Informative)
http://science.slashdot.org/article.pl?sid=08/01/14/0219246&from=rss [slashdot.org]
Re:Only a 24-hour lifespan? (Score:5, Informative)
If you make a tear in balloons fabric - it will slowly descend as the helium inside the balloon leaks.
Of course, if you tear balloon apart - it will fall lake a lead weight. But it's rather hard to do.
Re:Why not tethered? (Score:2, Informative)
If you tether the balloon, the altitude has to be very low or else the cable would be a hazard to aircraft. The whole idea is to put these up so high that they are well out of the way of air traffic. Also, the higher you go, the bigger the area you can cover.
Think of these as cheap, low altitude satellites.
Re:Only a 24-hour lifespan? (Score:2, Informative)
Whatever colour, we're screwed (Score:3, Informative)
Re:Only a 24-hour lifespan? (Score:3, Informative)
According to the article:
Re:Why not tethered? (Score:3, Informative)
Re:Only a 24-hour lifespan? (Score:4, Informative)
I spent a year launching weather balloons from Antarctica [gdargaud.net]. They take about one hour to reach 20~30km altitude, then the latex tears up (remember, as the pressure decreases, the volume increases) and the plummet to the ground in less then 10 minutes. In rare cases what's left of the latex will form a parachute shape and they will drop slower.
If you fill them more, they go up faster and blow up earlier (as the latex reaches its maximum thinness earlier). If you underfill them, you get less buoyancy [wikipedia.org], and they can float for a long time if they don't go up to where they'll pop, which is probably what you want here.
But I have to remind you that:
Re:Why? (Score:3, Informative)
Microsoft is underwriting the development and launch of a communications satellite for Africa. Cameroon: Microsoft Partners With Schools for IT Development [allafrica.com] You can not be more "out there" than that.
Solved Problem? (Score:1, Informative)
assuming you want to limit yourself to line of site RF
(for a bunch of reasons) then what's wrong with ground based
towers?
Depending on wind/weather issues, I would think you could
even build structures out of wood.
Guyed towers can reduce the steel requirements a lot though,
with sections being able to be carried by humans or animals.
100 ft guyed towers are pretty cheap to erect. Probably less
than $5000. Don't need much concrete either.
Or take advantage of topography (hills)
Here's an analysis of height requirements vs distance
(frenel distance issues etc)
http://www.rand.org/pubs/research_memoranda/RM3762/RM3762.chap5.html [rand.org]
100 ft tower can probably get you a 20 mile link at 5Ghz no problem.
10 of them to go 200 miles.
your local repeaters.
Re:Cost Analysis (Score:4, Informative)
The coverage should be ~50 mile radius.
To build a base station to do the same thing you would need at least a 300' mast and microwave links between them, plus you have to lease the ground. I don't think you can pull it off with less than a 3-year payback; you also need more prime airwaves.