Radios are a very common instrument for each and every one of us around. Different types of radios are known to us such as the old AM radios, the new FM radios but all these are only radios that can receive radio signals either in AM mode or FM mode. A rather deeper and a more serious use of radios are made in emergency services such as the police departments, fire fighters, ambulances, armies etc. All of these use radios and these radios work best on land. Another use of radio made in the defence is by the navy.
As the navy has to do all its work in or around water, a special radio called Marine radio is used for communication.
This Marine radio makes use of the wireless radio technology for receiving and transferring signals over and below the sea. Since defence is a very important and a secret part of any country, special frequencies are used for receiving and transmitting the messages. Wireless radio transmits the radio frequency through a medium, either air or water, and hence is highly susceptible to signal losses and noises at the receiver end.
Hence, special high frequency waves are used that can penetrate deep into the ocean and avoid signal losses and attenuation. Also since these waves travel through a medium, safety is often a concern and so even after taking all of the care to avoid such unwanted copying of signals, as a safety measure, the messages are sent as codes that need to be deciphered at the receiver end.
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