Wireless bridge

Curtis Maurand cmaurand at xyonet.com
Thu Jun 18 17:13:17 UTC 2009

Lyndon Nerenberg wrote:
> On Thu, 2009-06-18 at 11:54 -0400, Peter Boone wrote:
>> Oh I know. Luckily it's located in an industrial area just on the
>> outskirts
>> of the city. There isn't a lot of other WiFi (in my opinion); 3-5
>> total
>> SSIDs spread across 2 of the 3 physical channels (1,6,11) depending on
>> which
>> rooftop you measure from. 
> 2.4 and 5GHz license-free Wifi is license free because the frequencies
> are shared with the ISM (Industrial/Scientific/Medical) services. In an
> industrial area, competing WiFi is the least of your worries. These
> frequencies are also used by industrial grade heating units. Got anyone
> in the neighbourhood running a large plastic shrink wrap machine, for
> example?

Motion sensors also run in the 2.4GHz range.

> You can't directly detect these other users with a Wifi transceiver.
> Depending on the nature of the interference you *might* be able to hear
> it directly on a scanner (if you can find one that covers those
> frequencies), but you really need a good spectrum analyzer to tell
> what's going on.
> Anyway, don't assume the competition for spectrum is only other Wifi
> units.
> --lyndon

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