[re-sending due to problems with some mailing lists, sorry for the spam]
On 07/20/2011 07:56 PM, Chris Wilson wrote:
Related to this, I've been asked to comment about a proposed project to
create a free, open source, open hardware, country-wide wireless network
infrastructure in Madagascar using FabFi.
Does anyone have any thoughts about the feasibility of this (my gut
feeling is "infeasible"), know of anyone who has succeeded or failed in
any such project before, or have any thoughts about or experience with
FabFi?
I understand the desire to recycle materials from the dumpster to make
antennas, or at least reflectors. It's cheap, in particular if labor
cost is not an issue.
However, your mileage may vary:
a) you have no idea of the gain and radiation pattern of such an antenna
b) you might actually reduce the possible coverage area more than necessary
c) you might - at least in the long term - do damage to your transmitter
due to bad SWR
d) in some countries, you're only allowed to use antennas that have been
designated by the equipment manufacturer to be compatible with his
equipment. However, in practice, authorities won't complain as long as
you stay within the power limits. But that's hard to prove/argue if you
don't even know your antenna gain from a datasheet...
I suggest that whenever you can afford real antennas, use real antennas
that are reasonably priced. Actually, I'm interested in useful suppliers
e.g. from China myself and I'm more than willing to go shopping e.g. to
Shenzen.
However, I like the idea of open source / creative commons licensed
building instructions for antennas that can be made using materials from
the next hardware store. But the antenna should be designed by someone
who is experienced in antenna design and knows what she's doing...
Just my 5c from Hong Kong
Alex
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