FM Radio Receivers History And Essential Facts

Radio receivers are apparently an extremely significant element of radio and wireless technology. Their performance is serious to a lot of applications. The fundamental radio receiver concepts including the super-het or super-heterodyne receiver and other topologies such as the direct conversion receiver are of immense attention. Fundamentals such as selectivity, sensitivity including signal to noise ratio, and noise figure, dynamic range, and many more are of immense significance to any radio receiver. FM radio receivers are used to decode the signals, which are transmitted with the FM technique. The information is superimposed with the carrier signal by varying the frequency of carrier signal. The FM radio frequency band characteristically widens from about 87 to 104 MHz.

In FM stereo radio reception, a broadcast FM stereo signal is decoded or demodulated to create right and left channel audio outputs. Many of the FM radio receivers are of the superhetrodyne variety. It means that the FM radio receivers have the main objective of releasing an intermediate frequency and this is done through a process known as heterodyning or beating. Being the superhetrodyne type of radio receivers, the intermediate frequency used in these receivers is considerably low so, FM radio receivers have many benefits, such as better selectivity, better sensitivity within a particular frequency band, and also they provide uniform sensitivity and selectivity.

An FM radio was introduced at the beginning of 1960s but was rejected by the FCC. In actuality, the broadcast was launched by Edwin Howard Armstrong. Then in 1946 the first FM broadcast band was specified and that was 42 to 50 MHz. This FM band was eliminated and now this band is basically used by the fixed, mobile radio services. As there exists a lot of noise fidelity problems in AM broadcasting and reception, to avoid or solve these problems FM radios were invented. The FM receiver that was designed in the beginning had design complexity and it employed a super-heterodyne converter. It also used a discriminator, a broad intermediate frequency band, and a limiter stage. However, the earlier FM radio receivers were not much simpler in their design to receive the radio signals. This was known to Armstrong, who was the inventor of modern radio systems. He knew all the ways of receiving the FM radio signals. When the FM radio receivers were commercialized, they were manufactured with simpler designs.

Unlike AM radios, FM radios are much more efficient. They have many advantages over the conventional AM radios. Some of the features are: there is no threat of interference in frequency modulation, so the signal received by the FM radio receiver is not interfered or it does not contain any static or spurious noise. The FM radio receiver can perform efficiently in urban areas in spite of tall buildings or any other kind of interference. They are much lighter than a traditional AM receiver. Apart from all these they produce good sound quality. You can find out more about radio receivers at => http://www.bestsatelliteradioreceivers.com

Major manufacturers of FM radio receivers include: Shenzhen lees digital technology co. limited, bao yuan electronic co., city electronics limited, better electronic industrial limited and conquer international co. limited.

http://www.youtube.com/watch?v=vYAPrfMciWkhttp://www.youtube.com/watch?v=BEFfKZPrGPU