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

Brenda Wallace shiny at cpan.org
Tue Jul 20 19:29:31 EDT 2010

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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