They're usually generated by the transmitter ... that's where they come from ...
and they travel to the receiver as electromagnetic radiation, just as light from the
sun and heat from the fireplace both travel to you.
This is a transmitter that works in conjunction with your car stereo to broadcast content from your mp3 player over your radio using FM radio waves. This can also work with some digital recorders.
Waves, such as electromagnetic or sound waves, travel from a transmitter to a receiver by propagating through a medium or the vacuum of space. When a transmitter generates waves, they travel outward in all directions until they reach the receiver where they are detected and converted into a usable form of signal. The speed and distance the waves travel depend on the specific properties of the wave and the medium through which they are propagating.
FM transmitter : In this case the frequency of a carrier signal is modulated/altered in accordance with that of frequency of modulating signal. TYPES OF FM TRANSMITTER: 1> directly modulated FM transmitter. 2>indirectly modulated FM transmitter. 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 portable media player, CD player, or satellite radio system. The sound is then broadcast through the transmitter, and plays through an FM broadcast band frequency. Purposes for an FM transmitter include playing music from a device through a car stereo, or any radio.
From the research I have done, the best FM transmitter will depend on what you are using it for. Two that I found come rated with 4 and 1/2 stars are the Belkin TuneCast F8Z498-P FM Transmitter and the Griffin itrip auto fm transmitter for ipod.
an iTrip transmitter is an FM transmitter that is compatible with Apple iPods. You can plug in your iPod, and it will play your music through an intermittent FM station.
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The best place to find a FM transmitter for your iPod is at Best Buy. You can also go online and use their website to find out the price regarding the FM transmitter.
FM radio has the higher frequency which is why it sounds better. AM is a lower frequency but can travel further because the waves bounce off
Amplifier is used in an FM transmitter to increase the level of a signal suitable for transmission
AM radio waves have longer wavelengths compared to FM radio waves. This means that AM waves are better able to diffract around obstacles and travel farther distances. FM radio waves, with their shorter wavelengths, are less prone to diffraction and tend to travel in straight lines, making them more susceptible to obstacles blocking their path.
Vacuum is the poorest transmitter of sound because it is a medium that does not contain particles for sound waves to travel through. Sound waves require a medium to move through, such as air, water, or solids, and cannot travel in a vacuum.
They travel just like the radio waves that make your car radio work. They are sent from a transmitter - and picked up by your phone - the phone sends radio waves back to the transmitter to complete the circuit.