[Closed] Mysteries of the Universe (physics question)

Mysteries of the Universe

This was my favourite one. The evil counterpart to Battle Cat.

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The warmer weather increases the likelihood of dynamic thermular vortices that can have a direct effect on the range/stability of a wireless signal transducer.
Have you tried capacitating the flux on your radio?

That looks like a marital aid ^

Guess the same reason we used to get cross-channel interference on TV and radio living on the coast in the 80s during hot weather high pressure conditions.

Not sure on the sciency stuff behind it. Clear atmosphere perhaps allowing the signal to go further. Interferes with local stuff then.

Cool thing is I could get Channel TV from Devon. Sometimes even good enough signal to get teletext off it. On rare occasions a French station also.

Probably not the cause of your wifi problems

[url= https://www.rsm.govt.nz/consumers/what-is-interference/radio-interference ]"FM vertical layering of moisture content and temperature in the atmosphere (inversion layers) can occasionally cause signals to travel hundreds or thousands of kilometres further than usual. An inversion layer (or duct) is most commonly observed over high pressure regions and may affect radio signals for several hours to several days. The phenomenon is commonly referred to as anomalous propagation and is more likely in hot, dry weather in late summer."[/url]

I think your local WiFi is unlikely to be affected by anything unless a component is faulty andd is affected by by a temp difference for example. The digital radio could be affected by atmospheric conditions though. High pressure on a cold clear night though should improve transmission conditions? Is that not when the ham radio guys bounce stuff of the ionosphere and get Australia and stuff?

What cbike say.
More likely router built to a cost, no fan and poor air flow. Slightly warm ambient temp pushes the temp inside the case up by the same amount, just enough to start upsetting things.

Hot air is thinner, so radio waves spread out further so signal is weaker, also why the london velodrome is a constant temp & has "air locks" so the air is the optimum temperature for a cyclist to move through quickly

Can't remember all my physics, EM Radiation in a vacuum should work to the equation:

Freqency=speed of light/wavelength.

That changes in atmosphere as the molecules in the atmosphere intefere and instead of speed of light you get speed through the medium.

High pressure air is more dense so the wave slows down.

20 years ago I could probably write the equation down but not had to look at it for years. Hopefully someone who does radio for a living and knows the physics can explain it better.

Quick double check suggests the physics effect wouldn't be a problem with the short ranges for WiFi.

Probably the router then.

Dry joints on the PCB, making intermittent contact if the case or board is flexing a bit?

Irradiated Phlogiston ionising the super heterodyne triodes.

When it is this hot, it is a proven fact that the universe cannot be arsed

Erm... aren't Wifi signals digital? I would imagine that temperature differences and inversions and air pressure anomalies would affect analogue (radio) signals but not digital?

By all means shoot me down in flames if I'm wrong...

All digital is analogue too. But digital has scope to detect or correct upset signals. If the signal is weak then it is weak.

Erm... aren't Wifi signals digital? I would imagine that temperature differences and inversions and air pressure anomalies would affect analogue (radio) signals but not digital?

This helps in understanding your point

From that video, "Noise is not a problem for digital" ... err, rubbish.

Digital is sent on carrier waves just the same as analogue. The wave itself isn't digital. It's just the information on it is easier to reassemble accurately.

If there's enough noise on the carrier, some of the 1s and 0s are lost, and on streaming connections there may be no error correction as that can be time consuming and take extra bandwidth. Even if there is, enough degradation and there's not enough to reassemble the data accurately. Data is lost.

The more complex or higher bandwidth involved, the finer the detail of the digital signal and it's easier to lose information with a degraded signal.

GSM mobile and beyond into 4G etc, are all digital. Yet a lot of the time you get break up in the audio. It also will drop down to a lower quality when signal noise is too great or strength is too weak. Lower quality takes less bandwidth so is easier to get through.

Same goes for DAB radio break up, Sky TV at times breaks up due to atmospheric conditions (mostly down to dense cloud though).

A lot of problems people get with broadband connections, whether via a phone line or cable, is down to signal noise. Too much noise and the router and headend will renegotiate the connection and drop to a lower speed to ensure a more reliable connection. Distance from the exchange or cabinet introduces noise and the further you are, the lower the signal to noise ratio and the lower the speed. Also with more noise the more likely your broadband connection will drop entirely and the router will spend time trying to reconnect. Out of interest, broadband is also affected by weather conditions, which can affect noise on the line.

I knew as soon as I saw 'mysteries' in the thread title this was going to be a question about women trouble.

Your [url= http://singletrackworld.com/forum/topic/improving-wife-signal-in-house ]wife[/url] is just feeling a little under the weather. Maybe try buying her some flowers or some chocolates or something.

That looks like a marital aid

Or one of them.

By all means shoot me down in flames if I'm wrong...

This is STW - you'll get shot down in flames even if you're right

Does anyone know if this is related to why I can't have the DAB radio on in my Passat and something charging off the fag lighter port at the same time? Radio loses signal... always foxed me that.

Same. Noise. I get it when charging certain things in the car. Some devices worse than others. Electrical noise down the cable into connected systems and in some cases RF noise (worst is my chargeable torch).

In my case I only have FM and it creates loads of fuzz noise. It's enough that I can see it would knock DAB out entirely due to too much noise.

Another issue I get is when I turn on the rear window heater it generates noise on the radio. Reason is because the aerial in my Honda is the heater element. My rear window got broken and replaced with a third party one, and ever since it's had this problem.

Back to WiFi - could be the dry joint suggestion. Sony device you say? I've had issues with Sony kit and dry joints 😉 (pure coincidence probably). Not sure weather would cause noise issues.

From that video, "Noise is not a problem for digital" ... err, rubbish.

Funny but having watched the video and read your explanation, they say the exact same thing.

Well it's back to working fine today, but then the weather is a bit cooler and there are clouds about haven't got a barometer so can't check the pressure, but the winds in the South West and that cures most issues with Wifi.

Thanks to everyone who bothered, it's still a mystery to me allan23 seemed to probably have an answer that will be enough to set me pondering about some thing else, that and my 'submarines in space' idea also having been quashed recently.