[TriLUG] Wifi Bridge

[C TC via TriLUG]

Got it. The link explaining diversity antennas is very helpful.


thnx

On Thu, Oct 29, 2015 at 10:59 AM, Bill Farrow <bill at arrowsreach.com> wrote:

> On Thu, Oct 29, 2015 at 9:57 AM, C TC via TriLUG <trilug at trilug.org>
> wrote:
> > I'm curious about the info below.
> > With a single transceiver, would using the same length antenna
> > cables (on both sides) solve the issue; or are you saying the antennas
> > need to "see" each other? > Not have a metal wall between them.
>
> Wifi Router/AP/Extenders are designed with two antennas to help with
> multipath signal problems. The antenna are optimally spaced to ensure
> that at least one of them will receive a strong signal.
>   http://www.antennaplus.com/TechCenter/understanding-diversity.aspx
>
> If you place one antenna outside, and one inside, both antennas will
> suffer from deadspots as the environment around them changes. The
> other issue is that the wifi transceiver could decide to switch off
> the antenna that is getting low signal strength.
>
> Think about it this way. The wifi extender receives a packet from the
> antenna outside. If it doesn't hear an ACK for that packet within a
> short period of time, it re-broadcasts it - which antenna will it use
> ? Most likely it will have decided that the one that it received it on
> has the best signal to noise ration (SNR) and it will use that
> antenna. The laptop inside the shed will not hear the packet, and the
> external wifi will be degraded by duplicate packets taking up
> bandwidth.
>
> Bill
>