The Working Phenomenon of FM Transmitter

Posted by leahgillam on June 4th, 2013

We receive radio signals in two modes; theamplitude modulation and frequency modulation, known more popularly by their abbreviations AM and FM. In amplitude modulation, the amplitude of the signal varies in order to keep the frequency constant. In the case of FM, amplitude is kept constant while altering the instantaneous frequency for superimposing the signals on a carrier wave. FM was used by amateur operators in 1930s before it established itself for commercial broadcasting in early forties.FM transmitters, since then, has established itself as a favorite form of transmission owing to its wider bandwidth as it has the ability to reduce the noise to zero level.

FM transmitter can be plugged into a headphone jack or to any output port of an audio device and immediately it begins the broadcasting of the sound. It is possible to receive such transmissions through car stereo or any other radio and you may easily enjoy the music. The source of power is usually through batteries. In this case,an audio signal from the output device is converted by the device into FM signals. An individual can use frequency range between 87.5 MHZ to 108 MHZ. It is possible for a portable radio toreceive this signals from a distance of up to 100 feet and it pick up the signals even further if the fm transmitter is kept in higher elevation.

Uses

FM transmitters can do a wonderful job with the modern gadgets. If you are travelling in a group of vehicles, it will be possible to establish connection between the lead vehicle and the other vehicles that follow it. This will help them to remain in constant communication without the help of telephones. It can be linked to devices like computers, iPods, MP3 players, laptops, etc and allow their speakers to receive radio signals and use their speakers to play the signals that are received through the FM transmitter. However, these devices may not work with all and may need compatible transmitters.

Limitations

There are hundreds of models of FM transmitters are available in retail and online shops. You will get costly but quality branded transmitters or cheap Chinese made generic models that come at throw away prices but you cannot expect the same type of quality as in branded models. You may sometimes even get MP3 players with built in transmitter. FM transmitter has its own limitations, it cannot be played in places with stronger radio signals and even if they work, the emanating sound will be noisy and harsh and use of powerful devices is legally restricted.