[Server-devel] Samoa Deployment - planned hardware for 30 July 2010

[Rodolfo D. Arce S.]

I have some experience with networking and wifi links, and what Carlos
states is correct

Although ubiquity nanostations are used generally to make
point-to-point connections over a long distance ("long" compared to
regular wifi connections made in the same frecuency with conventional
equipment). There are some models that can be used to connect large
areas, but AP coverage isn't your only issue

It is true that a number of factors influence the quiality of the wifi
coverage, but the general issue is this.. wifi connections are
bi-directional.. meaning that if your AP can reach a 1 mile radio, and
you computer antenna can connect to only 30 yards.. you need to be 30
yards from the AP. There are a number of other factors that can
improve or degrade the signal, but in empiric knoledge, this holds
true.

When you're thinking about connecting a school, any conventional
AP/Router can work as long as you stay withing the 40 meter radio,
with 1 or 2 15 cm think wall in between, but laptops should be as
close as possible to the AP.. again.. empiric knowledge.

This AP close to ceiling hypothesis will be tested next ;-)

Cheers.. R

2010/7/20 Brenda Wallace <shiny at cpan.org>:
> On Wed, Jul 21, 2010 at 11:21 AM, James Cameron <quozl at laptop.org> wrote:
>> On Tue, Jul 20, 2010 at 11:02:47PM +1200, Tom Parker wrote:
>>> The 400mW Ubiquiti device seems a good choice for a smaller number of
>>> laptops over a wider area, but I'm no expert on these things. How many
>>> walls can the TL-WR741ND penetrate?
>>
>> Impossible to predict.  It depends on the materials used in the walls,
>> the thickness relative to the wavelength, the humidity, and the
>> structure holding the wall.  The floor and ceiling construction also
>> has a significant impact on signal propagation; they are in the Fresnel
>> zone.
>>
>>> Is a higher transmit power only
>>> really relevant if you're talking to an equally powerful partner?
>>
>> As a general rule yes, but there are a few exceptions.
>>
>> 400mW isn't that much greater than 200mW; radio power doubling does not
>> double the range.
>>
>
> I've had more success with wifi by placing the antenna in the roof
> space. Generally walls go only as far as the ceiling, and ceilings are
> thinner than walls.
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-- 
Rodolfo D. Arce S.