Difference between FM and AM

2022-05-02 0 By

AM works by modulating (changing) the amplitude of the transmitted signal or carrier based on the information being transmitted, while the frequency remains constant.FM technology is completely different, in that it encodes information (sound) by changing the frequency of the wave and maintaining the same amplitude.AM, with its simpler transmitter and receiver, is also susceptible to noise, while FM is vice versa.The AM method of historical audio transmission was first successfully implemented in the mid-1870s to produce high-quality radios over telephone lines, as well as the original method for audio radio transmission.FM radio was primarily developed in the United States by Edwin Armstrong in the 1930s.Differences in spectral range AM radios have a frequency range of 535 to 1705 kilohertz, while FM radios have a higher frequency range of 88 to 108 MHZ.For AM broadcasting, there is one station every 10 kHz and one FM station every 200 kHz.Advantages and Disadvantages OF AM vs. FM The advantage of AM radios is that they are relatively easy to detect with simple equipment, even if the signal is not very strong.Another advantage is that it has a narrower bandwidth than FM and a wider coverage than FM radio.The main disadvantage of AM is that the signal can be affected by electrical storms and other RF interference.In addition, while radio transmitters can emit sound waves at frequencies up to 15 kHz, most receivers can only reproduce frequencies up to 5 kHz or less.Wideband FM was invented specifically to overcome the interference shortcomings of AM radios.An obvious advantage of FM over AM is that the sound quality of FM radio is better than that of AM radio.The disadvantage of FM signals is that they are localized and cannot be transmitted over long distances.As a result, more FM radio stations may be needed to cover a larger area.In addition, the presence of tall buildings or lots may limit the coverage and quality of FM.Third, FM requires more complex receivers and transmitters than AM signals.Purpose FM radios became popular in the 1970s and early 1980s.By the 1990s, most music stations had switched from AM to FM because of better sound quality.This trend can be seen in the United States and most of Europe, where FM channels gradually overtake AM channels.Today, voice radio (such as talk and news channels) still prefer AM, while music channels are completely FM.