Radio-controlled Submarine
A radio-controlled submarine is a scale model of a submarine that can be steered via radio control. The most common form are those operated by hobbyists. These can range from inexpensive toys to complex projects involving sophisticated electronics. Oceanographers and military units also operate radio-controlled submarines. Radio transmission through water As the conductivity of a medium increases, the more a radio signal passing through it is attenuated. High frequencies are also attenuated more than low frequencies, and tend to reflect off the surface of the water more. As is well known Communication with submarines, communication with military submarines uses very low frequency electromagnetic radiation for this reason. Military frequencies are well below allocated hobby radio control bands, but the lowest hobby bands - typically around 27MHz/40MHz - can penetrate several feet of water at short distances, typically less than 45 meters. Penetration at these frequencies is easie ...
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