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Where to start with using water supply lines as communication medium?

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Seekonk:
This reminds mo of back when we were doing ultrasonic whistles as a way of seeing flow in liquid sodium.  Couldn't exactly run wires at those temperatures.  Water was much easier to use for early research and only needed a garbage can and a pump.   We would blow the whistle, but results kept getting lower and lower.   Wait an hour and things would work again.  Turns out the whistle was making microscopic bubbles in the water and they absorbed the signal. So watch out for those bubbles!

Years after our town after installed plastic pipe everything started leaking.   The last time I saw a report more water was lost than sold.

tszaboo:
So any reason not to just place a 4G modem and a sim card on it, instead of spending loads of money on research?

Holes Flow:
Would 4G have any chance of going through 10' or more earth?

I was under the impression 4G signals were RF, and in the range of GHz: https://www.wpsantennas.com/cellular-frequency-information.aspx

hendorog:
I'd think water pipe looks like a bit like a round waveguide.

Dielectric is water and probably air.

We know water absorbs microwaves.
Smaller diameter waveguides have lower cutoff frequencies.

So if you could find a freq or freq range where the water didn't absorb the signal and was above the waveguide cutoff then it might work.

The might be other modes which can be used.

tszaboo:

--- Quote from: Holes Flow on September 19, 2019, 05:41:32 pm ---Would 4G have any chance of going through 10' or more earth?

I was under the impression 4G signals were RF, and in the range of GHz: https://www.wpsantennas.com/cellular-frequency-information.aspx

--- End quote ---

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