The Natural Philosopher  wrote:
> On 05/07/2019 22:35, mark lewis wrote:
>> On 2019 Jul 06 13:39:00, you wrote to Ahem A Rivet's Shot:
>>
>>>> or you have a lot of interference.
>>
>>> No interference at all. Nothing within 300 meters of my house.
>>
>>> Just metal walls and ceilings :0(
>>
>> flourscent lights?
>>
>
> Nope. Not even fluorescent ones!
>
> Even the LV are toroidal. Not SMPS

I suspect that your problem with Wi-Fi is not interference in the
conventional sense, but interference in the sense of constructive and
destructive interference.

The metal walls and ceilings create a cavity excited by Wi-Fi transmitters,
creating myriad regions of high and low signal strength separated by
inches.

Since Orthogonal Frequency Division Multiplexing uses multiple frequencies,
each frequency will have a different spatial distribution of high and low
signal, making coordinated use of multiple sub bands unreliable.

In a building with smaller and less speculative reflections, such
interference is not problematic, but in your case it is rendering OFDM
almost unusable. The MacBook exception is probably a consequence of its use
of MIMO antennas which a much more difficult in a smaller form factor.

--
-michael - NadaNet 3.1 and AppleCrate II:  http://michaeljmahon.com

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