Why FM is used for close area and AM for longer distances?

[AVALON]

WHY THAY USE FM FOR SMALL REIGON AND GOOD QUALTY WHILE THEY USE AM FOR FAR REIGONS

 

[claudiocamera]

am versus fm

The modulation technique has no relation to coverage.

What makes a small or bigger coverage is frequency and transmited power, which is respectivelly inversely and directely related to coverage.

Related to quality FM modulation has a better SN relation than AM, in order to know why it is necessary to study the topics.

 

[flatulent]

am v/s fm

AM is used at the lower frequencies where spectrum is scares. At the higher freuqency FM can be used with its wider bandwidth.

Another aspect is the strong signal capture of FM. Distant stations are not heard in the background as they are with AM.

 

[orbb]

why fm requires large bandwidth than am

FM can transmit information for longer distances than AM while retaining the information power. After a certain range, FM power drops suddenly to zero, so it is a good use for a local area.

 

[electron_boy]

am vs. fm

FM has a very large spectrum. theoretically infinite. so the energy is distributed throught the spectrum. but in case of AM , SSB, DSBSC we can restrict the band. and even we can cancel the carrier wave where most of the energy is wasted.

so for short distance we see just the quality so we choose FM but for long distance we have to be stingent in the bandwidth consideration so we use AM or SSB - suppressed carrier

 

[maharshi_qis]

am vs fm

The spectrum of FM is very high..so it is used at high frequencies..
Also Fm has strong signal capturing capability than AM..

 

[IBO]

am vs fm

FM use a large BW (more costly)

 

[desperado1]

am versus fm

Since, FM has large bandwidth.....what is the advantage of using higher frequencies ? Can't we transmit FM signals in lower frequencies as in case of FM ?