Assuming a cellphone could be made to be water resistant, would they get
a signal under water? Obviously, no one can talk under water, so
texting would be the only option.
But I doubt that there is such a thing as a waterproof cellphone made
anyhow. My only reason to ask this is because I'm curious if a
cellphone signal will penetrate water.
At the frequencies the phones work, they will not work under water. Maybe a
few inches at the very most if you are next to the cell tower.
Don't ask me to explain this.But at the bottom is a number for 1 mhz of only
.25 meters. That is less than a foot and the higher in frequency,the less
the radio waves will penetrate.
I had a radio controlled model submarine once. That worked underwater.
Tx was above obviously and the distance was only about thirty feet. I
don't suppose it went more than a couple of feet below the surface. It
had a timed surfacing device in case things went wrong. Which they
There are charts that supply the information for the amount of
absorption vs frequency in sea water. For the cellphone the field is
very spherical and will 'punch' through salt water much better than
the tower's rather planar field which will more follow the predictions
of skin depth, etc.
However, for fun, let's use your experience with the submarine. Assume
you had a 100mW 27MHz transmitter that went about thirty feet in
Adjust for power and frequency:
Assume power scales, so 1W goes 10X further.
Assume skin effect kills your signal, so at 900Mhz your signal will be
reduced by the sqrt(900/27), or about 1/6th
Therefore the cellphone should work to an adjacent tower about 30*10/6
or 50 feet into water.
That is far deeper than I would expect, wonder what it really is.
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