AM and FM in mobile phones.

@engg4world-KlW6QI • Oct 26, 2024

Oct 26, 2024

1.3K

Mobiles have FM as a feature to here FM radio. Here i hope this fm mode helps in hearing local news(inner state FM radio accessing) . but how abt AM ... How will AM help in hearning the news; is it that signal will cover long area so news of other states can also heared. 😛

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gohm

@gohm-F3UUpP • Mar 20, 2009

Reason being is AM radio has been phasing out for many years. Such a small group still listen to AM that electronic manufactures wouldn't cater to the feature. between the internet and satellite technology, you now can get information sent world-wide. Short wave and sideband are other older, though still used means.

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durga ch

@durga-TpX3gO • Mar 20, 2009

transmitting should not be a problem right Gohm?
I suppose hobbist still do it, juts that bulk manufacturing doesnot happen for AM radios.

By the way engg4world , any specific reason for you to rewind back in time 😛

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divyamoorthy89

@divyamoorthy89-64th2L • Mar 21, 2009

hi im doing my third yr elec & electronics eng..i need som project ideas..if u can mail to #-Link-Snipped-#ks

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devendra_jntu

@devendra-jntu-8zPuez • Mar 23, 2009

In am we are using carrier of frequency with in KHz range these frequecy signals are reflected from the ionosphere and covers large range where as in case of fm carrier frequency of order MHz those can be penetrated through ionosphere and covers small range.so while providing am band it should not be used by any one in world,but fm band can be used by one in the world by maintaining some distance between fm stations to avoid interference.......................😁

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arunhero99

@arunhero99-LRZv4M • Mar 23, 2009

Devendra, its refraction, not reflection for AM on the ionosphere. anyway, effect is same.
And interference by noise is heavy for AM actually. any drop/variation in power of the signal can change the amplitude disrupting the whole data. Otherwise devendras explanation is apt.
FM is line of sight (LOS) and AM is skywaves.AM is avoided nowadays as contolling the direction of refracted wave (directivity of fall) is too expensive and power consuming. Stary refractions can cause disruptions to local transmission.

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engg4world

@engg4world-KlW6QI • Mar 24, 2009

Thanks i got it .......i will come up with much more in detail with some examples...i am trying to research on signals.

thanks very much once again.😀

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sauravgoswami

@sauravgoswami-UAfTlI • Mar 24, 2009

well there are many form of transmitting signal these days apart from AM and Fm,although they are not as popular.

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