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There are two ways radio stations modulate their carrier waves: amplitude modulation, or AM, and frequency modulation, FM.Millions of radio waves--carrying sound wave signals and digital signals--reach your receiver every second. The receiver's tuner picks out a specific signal. Its amplifier strengthens that signal.

In FM broadcasts, sound signals are encoded by changing the frequency of radio waves.However, the relatively short wavelengths of FM waves means that they don't reflect off the ionosphere as AM waves do. Instead, FM waves pass through the ionosphere and out into space.

Radio: Uses of Radio Waves The prime purpose of radio is to convey information from one place to another through the intervening media (i.e., air, space, nonconducting materials) without wires. Besides being used for transmitting sound and television signals, radio is used for the transmission of data in coded form.

Radiocommunication Assemblies (RA) are responsible for the structure, programme and approval of radiocommunication studies. They are normally convened every three or four years and may be associated in time and place with World Radiocommunication Conferences (WRCs).

Commercial Function: Radio and television are often used for advertisements which help inform audiences about the existence of certain goods and services. Entertainment function: Drama, comic and musical programmes are aired on the stations to ease boredom.

Today's radio consists of an antenna, printed circuit board, resistors, capacitors, coils and transformers, transistors, integrated circuits, and a speaker. All of these parts are housed in a plastic case. An internal antenna consists of small-diameter insulated copper wire wound around a ferrite core.

MF/HF Radiotelephone Your VHF radio is intended mainly for short range communications, generally 5-10 miles, and at least 20 miles to a USCG station. To communicate at longer ranges, you will normally need a satellite telephone or an MF/HF marine radiotelephone.

Radio is a way to send electromagnetic signals over a long distance, to deliver information from one place to another.When radio signals are sent out to many receivers at the same time, it is called a broadcast. Television also uses radio signals to send pictures and sound.

The radio receives electromagnetic waves from the air that are sent by a radio transmitter. Electromagnetic waves are a combination of electrical and magnetic fields that overlap. The radio converts these electromagnetic waves, called a signal, into sounds that humans can hear. Radios are a part of everyday life.

Radio works by transmitting and receiving electromagnetic waves. The radio signal is an electronic current moving back and forth very quickly. A transmitter radiates this field outward via an antenna; a receiver then picks up the field and translates it to the sounds heard through the radio.