[hackerspaces] spread spectrum para-Internet?
Walter van Holst
walter at revspace.nl
Thu Feb 16 11:46:48 CET 2012
On 2012-02-16 07:45, James Arlen wrote:
> While theoretically possible, one runs into issues around
> long-distance backhaul between nodes pretty quickly - land topology
> tends to get in the way and those pesky oceans are hard to cross.
It depends, Wireless Belgium has achieved amazing distances so far:
I think especially in rural areas it is a lot easier to get to
alternative infrastructures using unlicensed spectrum than you may
realise. ISP services tend to be outright poor in rural areas whereas
the amount of buildings that get in the way of WiFi or free space optics
is low. I think your average farmer is willing to look into allowing a
WiFi repeater on top of a grain or fodder silo if that helps him and his
neighbours to get proper internet.
OTOH, we've been looking into getting the Belgian network expanded into
the Netherlands and the cost of each serious repeater node is pretty
> Look at some of the mesh radio stuff and some of the early
> experiments in optical networking -- there was a DIY 10mb/s optical
> ethernet system at one point called RONJA that would haul over a
> pretty decent distance (approx 1 mile at 10mb/s full duplex)
The Ronja stuff is still around, the Twibright guys are amazing:
One of the things that would be interesting to hack is finding out
whether it is possible to use current generation high-power LEDs for
this purpose. That might solve the current range limitations of the
> As long as you steer clear of spectra that the government considers
> to belong to someone else, you should be fine -- and all of the old
> software is still out there.
The fun part is: especially free space optics is never going to be
regulated at all.
Another avenue worth looking into for extreme long-distance
low-bandwidth digital communication is meteor burst radio:
HAM-licenses aren't too hard to get nowadays (they dropped the morse
requirements) and given that this was feasible in the 60's, it should be
doable at a much lower price now.
A big enabler for this would be open source modular phased array
antennas for the 2 meter band. Anyone knows about a design in that area?
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