Radio: Who Invented, Examples and Applications

Italian engineer and inventor Guglielmo Marconi (1874-1937) created, demonstrated, and marketed the first long-distance wireless telegraph. He broadcasted the first transatlantic radio signal in 1901.

Radio is the technology of communicating and signaling using radio waves. Radio waves are usually electromagnetic waves of frequency within the range of 30 hertz and 300 gigahertz. 

Electromagnetic waves are generated by a certain electronic device called a transmitter. This transmitter is connected to an antenna that can radiate the waves.

Then the waves are received by another antenna which is connected to a radio receiver. Thus, radios can transmit and receive electromagnetic waves that can move at the speed of light.

Radio is widely used in modern technology and radio communication, such as radio navigation, radar, remote sensing, remote control, two-way communication, air-traffic control, and television. Moreover, radio waves are important to carry information across space from a certain transmitter to a specific receiver.

Different Radio Systems

There are different types of radio systems that help in different types of communication, such as:

FM (frequency modulation).

AM (amplitude modulation).

OFDM (orthogonal frequency-division multiplexing).

FSK (Frequency-shift keying).

Satellite Radio.

The Following Are Some Examples Of Radios


Though it is a common device we often use, many of us don’t know it is a type of radio. Just like other radios, a walkie-talkie can transmit and receive radio signals. However, walkie-talkies have a limited battery life and a limited working range.

Ham Radio:

It is another kind of radio that can broadcast signals thousands of miles away. In a situation like a natural disaster, ham radios can relay important information if necessary.

Shortwave Radio:

Shortwave radio frequencies can interact with the ionosphere in a certain way. It can allow shortwave radio broadcasts to travel thousands of miles. 

Am Radio:

AM means amplitude modulation, in which audio signals can work to alter the strength of radio waves. 

Fm Radio:

FM radios emphasize the modulation procedure that can alter radio waves.

Applications of Radio 

Radio can help to communicate in different situations and places. Here are some of the most vital uses of radio, according to its functions.

Two-Way Voice Communication:

A two-way radio is mainly an audio transceiver. This means it has a transmitter and receiver in the same device and is used for bidirectional person-to-person voice communication. 

This Radio Line May Be Half-Duplex, Like in A Walkie-Talkie:

Which uses a single radio channel where just one radio can be transmitted at a time. Another radio line may be a full duplex, where both people can talk simultaneously, like in a cell phone. 


Broadcasting is the one-way transmission of important information where the information is received by the receivers belonging to a public audience. Broadcasting uses multiple parts of the radio spectrum, which depends on the types of the desired target audience and the types of signals transmitted.

Cell Phone:

A cell phone is a wireless and portable telephone that is connected to the telephone network by radio signals, which are exchanged with a local antenna at a cell tower or a cellular base station.

Satellite Phone:

It is another wireless and portable telephone that is very similar to a cell phone. It is connected to a specific telephone network via a radio link to an orbiting communications satellite rather than cell towers.

Wireless Networking:

An automated radio link that can transmit data between various wireless devices and computers using radio waves, connecting the devices in a computer network.


It is a simple or one-way transmission of operation data and measurements from a remote device to a receiver for monitoring. Telemetry is used to monitor drones, missiles, satellites, etc.

So, we have provided some important details regarding radio that can benefit you.

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