Parameters
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Amplitude Modulation
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Frequency Modulation
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Evolution
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Formulated in the 1870s, AM is a relatively older modulation process.
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FM which was found in the 1930s by Edwin Armstrong.
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Technology
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AM stands for amplitude modulation where the amplitude of the carrier is modulated as per the message signal. The other aspects of the carrier wave such as frequency phase etc. remain constant.
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FM means frequency modulation and in it only frequency of the carrier wave changes while amplitude, phase etc. remain constant.
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Frequency Range of Working
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540-1650 KHz
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88-108MHz
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Power Consumption
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Less amount of consumption.
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FM based signal transmission consumes a higher amount.
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Signal Quality
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Noisy and distorted one, because of very low frequency range of signal.
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Signal quality is a lot superior in FM.
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Fading
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AM radio channels often face the problem where sound intensity.
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FM radio channels have constant good reception.
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Wavelength Difference
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AM waves work in the range of KHz.
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FM waves work in MHz range.
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Bandwidth Consumption
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AM signals consume 30KHz of bandwidth.
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FM 80KHz is the bandwidth consumed by each signal.
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Circuit Complexity
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Amplitude Modulation is an older process and has a very simple circuitry.
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Frequency modulation requires a complicated circuitry for transmission and reception of signal.
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Commercial Aspects
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Setting up an AM based radio communication system is very economic.
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FM is a fairly complicated communication system and requires high capital investment and expertise at work.
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A few radios come with AM and FM functionality !
All Metro and most Tier-2 Cities have their own commercial channels that work on FM !
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