This page covers advantages and disadvantages of AM and FM. AM stands for
Amplitude modulation and FM stands for Frequency Modulation. The other
advantages and disadvantages are also mentioned.
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AM is the short form of Amplitude Modulation. Here amplitude of RF carrier
is varied in accordance with amplitude of modulating signal input. FM is the
short form of Frequency Modulation. Here frequency of RF carrier is varied in
accordance with frequency of modulating signal input. AM and FM both are used
as analog modulation techniques.
The figure-1 depicts
modulated output for AM, FM and PM modulation types. Refer AM vs FM vs PM operational
aspects. The figure-2 depicts AM propagation and FM propagation. As shown AM
propagation happens due to reflection from ionospheric layer. FM propagation
relies on Line of Sight communication path.
Advantages of AM-Amplitude modulation
Following are
the advantages of AM(Amplitude modulation):
➨AM signal are reflected back to earth from ionosphere layer. Due to this fact, AM signals can reach far places which are thousands of miles from source. Hence AM radio has coverage wider compare to FM radio.
➨AM signal are reflected back to earth from ionosphere layer. Due to this fact, AM signals can reach far places which are thousands of miles from source. Hence AM radio has coverage wider compare to FM radio.
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Disadvantages of AM
Following are
the disadvantages of AM:
➨The most natural as well as manmade radio noise are of AM type. The AM receivers do not have any means to reject this kind of noise.
➨Weak AM signals have low magnitude compare to strong signals. This requires AM receiver to have circuitry to compensate for signal level difference.
➨The most natural as well as manmade radio noise are of AM type. The AM receivers do not have any means to reject this kind of noise.
➨Weak AM signals have low magnitude compare to strong signals. This requires AM receiver to have circuitry to compensate for signal level difference.
Advantages of FM-Frequency modulation
Following are
the advantages of FM(Frequency modulation):
➨In FM, recovered voice depends on frequency and not amplitude. Hence the effects of noise are minimized in FM.
➨FM bandwidth covers all the frequency range which humans can hear. Hence FM radio has better quality of sound in comparison with AM radio.
➨In FM, recovered voice depends on frequency and not amplitude. Hence the effects of noise are minimized in FM.
➨FM bandwidth covers all the frequency range which humans can hear. Hence FM radio has better quality of sound in comparison with AM radio.
Disadvantages of FM
Following are
the disadvantages of FM:
➨At higher frequency, FM modulated signals pass through the ionosphere and do not get reflected. Hence FM has lesser coverage compare to AM signal.
➨At higher frequency, FM modulated signals pass through the ionosphere and do not get reflected. Hence FM has lesser coverage compare to AM signal.
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Source: rfwireless-world
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