[TriLUG] can't connect to wap when move it to alternate location
Neil L. Little
nllittle at embarqmail.com
Mon Apr 12 23:00:14 EDT 2010
Oh yeah Sharp carrousel circa 1980's still runs like a champ!
David Black wrote:
> ----- "Neil L. Little" <nllittle at embarqmail.com> wrote:
>> A microwave ovens operate around 900mhz.
> Only very early units none of us likely ever owned. ;-) Modern microwave ovens operate around 2460 MHz, directly interfering with wi-fi and Bluetooth operation on the 2.4 GHz band.
> Even with lots of shielding around the cooking cavity, on a spectrum analyzer it's a big, ugly signal that wanders several MHz in frequency as the oven operates. It's easy to spot because the energy of a nearby oven is stronger than almost everything else in the band. However, the duty cycle of the magnetron producing that UHF energy isn't 100%, so there's part of every 60 Hz cycle where it's quiet. That's when the "microwave oven avoidance" tech in some (most?) wi-fi and Bluetooth gear knows to transmit - of course at a substantial speed penalty.
> That's why I prefer channel 1 (2412 MHz) for single-channel wireless installations, as it's furthest away in frequency from most microwave ovens and seems to be least impacted. (Oh no, now everybody will start using channel 1!) :-P
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