What Is Radio Fm And Am

What is Radio FM and AM?What is Radio FM and AM?

By: Mohammad JobairBy: Mohammad Jobair

Agenda:Agenda:•What is Radio ?•What is AM and FM?•What is the Difference between AM and FM Radio?

What is Radio:What is Radio:

Radio is a small part of the electromagnetic spectrum that is used for a wide range of business and non-business purposes.

The Electromagnetic Spectrum The Electromagnetic Spectrum

The electromagnetic spectrum is a continuum of all electromagnetic waves arranged according to frequency and wavelength.

Electromagnetic energy:Electromagnetic energy:

is a term used to describe all the different kinds of energies released into space by stars such as the Sun. These kinds of energies include some that you will recognize and some that will sound strange. They include:

Radio Waves TV waves Radar waves Heat (infrared radiation) Light Ultraviolet Light (This is what causes Sunburns) X-rays (Just like the kind you get at the doctor's office) Short waves Microwaves, like in a microwave oven

All these waves do different things (for example, light waves make things visible to the human eye, while heat waves make molecules move and warm up, and x rays can pass through a person and land on film, allowing us to take a picture inside someone's body) but they have some things in common.

AM Radio: AM Radio:

Amplitude Modulation (AM)Amplitude Modulation (AM)• Amplitude modulation is the process of

varying the amplitude of a carrier wave in proportion to the amplitude of a baseband signal. The frequency of the carrier remains constant.

• Modulation is the process of impressing a low-frequency information signal (baseband signal) onto a higher frequency carrier signal.

The term baseband is used to designate the band of frequencies representing the original signal as delivered by the input transducer

For example, the voice signal from a microphone is a baseband signal, and contains frequencies in the range of 0-3000 Hz The “hello” wave is a baseband signal:

pressure modulation (sound)

electromagnetic wave modulation

Amplitude Modulation (AM) uses changes in the signal strength to convey information

Pressure modulation (sound)

electromagnetic wave modulation

Frequency Modulation (FM) uses changes in the wave’s frequency to convey information

AM vs. FMAM vs. FM

AM requires a simple circuit, and is very easy to generate. It is simple to tune, and is used in almost all short wave broadcasting. The area of coverage of AM is greater than FM (longer wavelengths (lower frequencies) are utilized-remember property of HF waves?)However, it is quite inefficient, and is susceptible to static and other forms of electrical noise.

The main advantage of FM is its audio quality and immunity to noise. Most forms of static and electrical noise are naturally AM, and an FM receiver will not respond to AM signals. The audio quality of a FM signal increases as the frequency deviation increases (deviation from the center frequency), which is why FM broadcast stations use such large deviation. The main disadvantage of FM is the larger bandwidth it requires

Difference between AM and FMDifference between AM and FM

1: AM radio is a Amplitude modulation but FM is a Frequency 1: AM radio is a Amplitude modulation but FM is a Frequency modulation.modulation.

2: FM can be filtered out when the tune received by receiver but in 2: FM can be filtered out when the tune received by receiver but in AM not.AM not.

3: The AM signal can be changed And difficult to get information 3: The AM signal can be changed And difficult to get information form it but in FM is constant.form it but in FM is constant.

4: AM is taken In low Frequency and not stereo but FM taken in 4: AM is taken In low Frequency and not stereo but FM taken in high frequency and its stereo.high frequency and its stereo.

5: AM can received as a analog but FM can be received as Digital.5: AM can received as a analog but FM can be received as Digital.

6: The Amplitude of Income will be muted in FM if its not that 6: The Amplitude of Income will be muted in FM if its not that much strong enough, but in AM whether its strong or not.much strong enough, but in AM whether its strong or not.

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