Under Water Radio Waves
Date: August 2006
How do scuba divers communicate with radio
underwater? Since radio signals have difficulty propagating
under water, how is it possible without a wire connection? What
frequency are these radio waves at? Is it very low?
This is not an easy question to give a short answer. The
attenuation (absorption) of radio frequency waves depends upon the
water's conductivity (salt content), temperature, depth, radio
frequency. In some cases transmission is done by water to air,
air-to-air, and back from air to water. A fairly good explanation
can be found at:
but the short answer is radio transmission in the "standard"
wavelength ranges is rather limited.
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Update: June 2012