On 06/07/2019 20:34, Michael J. Mahon wrote:
> 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.
>
That is the first half believeable scenario anyone has come up with.

However it doesn't explain massive fluctuations from two totally
stationary systems with any movement - me - in another room altogether.
Or why dumping wifi and re-enabling it takes  the laptop from 1Mbps to
58Mbps


--
"The great thing about Glasgow is that if there's a nuclear attack it'll
look exactly the same afterwards."

Billy Connolly

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