[TriLUG] Wifi Bridge

[Aaron Morrison via TriLUG]

Also keep in mind that on most (all?) units, only one antenna is the transmitter.  That will also affect performance. 

--am


> On Oct 29, 2015, at 11:04, C TC via TriLUG <trilug at trilug.org> wrote:
> 
> 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
> -- 
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