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Frequency modulation (FM) is the process whereby the frequency of a radio wave is changed (modulated) rapidly as a result of the changes in the sound that the radio is designed to transmit. In the 'old days' the height of the wave (amplitude) would be modulated to provide a changing signal that could be changed into variable sound by a suitable reciever. This is called amplitude modulation (AM). However, more recently (like 40 years ago) it was found that increasing the frequency to levels known as very high frequency (VHF) and modulating the frequency rather than the amplitude would enable a better quality of transmissions.
Also, the higher frequencies meant that radio waves did not travel so far so were less able to interfere with transmissions from other radio stations. The lower the frequency the longer the wavelength and some of the longwave radio transmissions will travel very long distances. The VHF transmissions of today require repeater transmitters located around the country.
What else can I help you with?
Is an electric current present when you put a wire on the north and south poles of a magnet?
it can be somtimes wene you have the right frequensy
What does AM and FM stand for in radios?
AM - Amplitude Modulation FM - Frequency Modulation
Need for modulation?
modulation
What are the two types of angle modulation?
Frequency Modulation and Phase Modulation
When modulation frequency is double the modulation index is halF and the modulating voltage remains constant the modulation system is?
frequency modulation..
How velocity modulation and density modulation related to each other?
due to velocity modulation density modulation occurs in TWT
What is the difference between frequency modulation and phase modulation?
The difference between frequency modulation and phase modulation is that with frequency modulation the angular frequency of the signal is modified while with the phase modulation, the phase angle of the signal is modified.
When modulation frequency is doubled the modulation index is halved and the modulating voltage remains constant the modulation system is?
the modulation system is of FM
In which Analog to analog modulation methods does the peak amplitude?
Frequency modulation Phase modulation
Why frequency modulation and phase modulation are called angle modulation?
i dont know ans. of this.
How does quadrature amplitude modulation works?
QAM is a combination of phase modulation & amplitude modulation.
What is the unit for modulation index?
Modulation index is also called as Modulation depth. The modulation index of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level.
