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Name: Ivan
Status: student
Grade: other
Location: N/A
Country: N/A
Date: August 2006

Question:
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?



Replies:
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:

http://www.qsl.net/vk5br/UwaterComms.htm

but the short answer is radio transmission in the "standard" wavelength ranges is rather limited.

Vince Calder



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