How does information get transferred through radio waves?

How does information get transferred from one point to another in radio waves, and in general any electromagnetic wave? How do the actual words for a radio get transferred in the wave?How does information get transferred through radio waves?The sound waves are modulated onto the radio signal at the radio transmission station. The radio device you play on the dashboard of your car then demodulates the radio signal and then plays it as an audio signal converted to sound by the speaker.



Two methods of modulation exist, which are used in radio:



AM, amplitude modulation (old fashioned, but still in use). The modulation process converts the audio signals such that the radio waves transmitted vary slightly in intensity of the electric field. Frequency is constant.



FM, frequency modulation (more modern). The modulation process converts the audio signals such that the radio waves transmitted vary slightly in frequency. Amplitude of the radiowaves is continuous.



There exist other methods of modulation (pulse-width modulation, pulse-position modulation, etc), which are more applicable to transmitting digital data, instead of analog audio data.How does information get transferred through radio waves?This question would require a very long answer to properly give you what you are asking for. There are many resources available on the WEB that will help. I have listed two below that may get you started.



A short answer is that your voice, which generates sound waves in the air, has to be converted to a similar waveform using an electric current. This may be amplified and sent to an antenna. The current moving up and down the antenna will cause electromagnetic radiation to be generated into the air. The wave may be picked up on a receiving antenna causing a small current to flow in the antenna circuit. This could be amplified and then this current may be used to drive a speaker thus converting it back into a pressure wave you hear as sound. Now if this was the way it was done, only one person could talk at any given time.



To help alleviate this problem we create a carrier wave, usually at a fairly high frequency (selected to allow the best propagation through the air) and it is assigned to one user or group of users. In this manner, many carrier waves may be used and assigned. Thus we have many radio stations that we tune to. On this carrier wave then we add our voice either as an adjustment in the amplitude (AM radio) or to the frequency (FM radio), and then send it to the antenna just as before. The receiving antenna works the same also with an added circuit that may be tuned to the specific carrier frequency. This tuning circuit receives all frequencies but when tuned to one frequency it will resonate causing that particular frequency to be much stronger than the remaining frequencies. This is then sent to a circuit that will remove the the carrier frequency and allow only the voice frequency to pass through. this is amplified as above and sent to a speaker.



Hope this helps,



Newton1LawHow does information get transferred through radio waves?The radio station and TV station uses equipment to vibrate an antenna.The vibration causes high pitch sounds. The antenna on your radio vibrates from all the high pitch sounds. The radio is designed to filter all the vibrations except one for mono, two for stereo, and three for stereo and video. Then the high pitch sounds are converted to a lower frequency so you can here them.



Signals are like having two metal pipes hanging from the ceiling about 10 feet apart. If you tap on one pipe you will here it from the other.