An FM transmitter is a portable device that plugs into the headphone jack or proprietary output port of a portable audio or video device, such as a media player, CD player, or satellite radio system. The sound is then broadcast through the transmitter, and plays through an FM frequency. Purposes for an FM transmitter include playing music from a device through a car stereo, or any radio without an audio input jack.
The FM transmitter plugs into the audio output of audio devices and converts the audio output into an FM radio signal, which can then be picked up by appliances such as car or portable radios. Most devices on the market typically have a short range of up to 30 feet (9 meters) with any average radio (up to about 75 feet (23 meters) with a very good radio under perfect conditions) and can broadcast on any FM frequency from 76.0 to 108.0 MHz (or 87.9 to 107.9 in the US). Some lower-cost transmitters are hard-wired to the 87.7-91.9 MHz band allocated to educational broadcasts in the United States, or a certain other smaller range of frequencies.
FM transmitters are usually battery driven, but some use the cigarette lighter socket in cars, or draw their power from the device itself. They are typically used with portable audio devices such as MP3 or CD players, but are also used to broadcast other outputs (such as that from a computer sound card) throughout a home or other building.
You can play MP3 files from your home stereo, from your computer, and from a portable player using headphones. But MP3 is still a relative newcomer in the world of car audio stereo. Use a wireless FM adapter. Plug the cable from an FM transmitter into your portable MP3 player. Then tune your car's FM radio to the right frequency and listen to your Car Carries MP3s. Unfortunately, sound quality varies because of local interference, and you're dependent on the batteries that power your wireless adapter.
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