How FM Radio works?

Updated: Apr 3, 2019

- FM Radio programs are transmitted over the air via radio waves,which is a part of Electromagnetic waves.

- Radio waves are similar to light waves, but exist at a frequency which is not visible to naked eyes.

- Electromagnetic waves are generated by Altering current(AC) which is the electric power used to run almost all the appliances.

- The Altering current creates Electromagnetic Radiation where some electrical energy escapes from the copper wire and transmitted in the air.

- Electromagnetic Radiation can be described as 'electricity in the air' or 'electromagnetic waves (in this case, Radio waves) in the air'.

- Electricity in the air is nothing but some random noise.

- To turn this random noise into useful signals, it needs to be modulated first.

- FM uses Frequency Modulation. To understand this better,consider a signal with steady Frequency.

If the Frequency is unchanged,there is no use in that.

- So if an information is introduced in the signal,it make the Frequency to change from low to high.Hence music or voice can be transmitted by a carrier frequency.

- FM Radio operates in the range of 87.5 MHz to 108.0 MHz.

- The distance range is less than 100 miles but the sound quality is greater since it is operated on a high bandwidth range.


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