The radio frequency is a vibration, which is converted to an electrical signal by the radio transmitter and receiver. There are two ways that these signals are sent. First, by an antenna that picks up the radio waves on a fixed point and broadcasts them. Second, by a device called a radio that receives the radio waves and converts them to an electric signal. Because of the difference in the transmitter and receiver coils, there are differences in the frequencies that are produced. https://radioonlineluisteren.nl/
AM radio uses the power of gravity to send their radio waves over long distances. There is a dipole moment when the radio wave encounters the earth, due to the earth's poles. When this dipole moment is nearly zero, there will be no echo, and the radio will be broadcasting at the same frequency as the transmitters transmitting in the same direction. To compensate for the slight dipole moment, a transmitter on the far side of the earth broadcasts a signal with a slightly higher frequency than the one that was initially used, since the gap has widened.
Short of using the transmitter to send a message, there are other uses for fm radios. Some manufacturers have designed products to offer voice broadcasting capabilities. In this way, a single transmitter sends voice messages to each recipient at a different frequency. Other or services work to broadcast live broadcasts of weather and other news. Many companies also use these fm services to broadcast music.
As with all technologies, there have been some criticisms about how well FM radio performs in certain situations. For instance, when two cars come in front of each other on a road, only one of them will come to a complete stop. If each vehicle had an FM radio, they would be able to communicate what they needed to communicate to one another without blocking on each other's radio. But in the case of World War II, the FCC fined radio stations for not properly disclosing information regarding military frequency assignments. The government is still dealing with that problem today.
It has been proposed that a standard method of signaling be developed for both military and commercial applications. Among that standard method is what is known as the carrier wave, which is a wave that cannot be altered in any way. So while a military application might need to change the radio's frequency to something different from a residential or business setting, for everyday use it would simply be changed to a carrier wave, which is always the same frequency. That allows fm radios to transmit information in essentially the same way to every location. It also allows for easy communications, since anyone listening to the broadcast will get the same signal.
Today, many radio operators are using what are called FMCSA (Free Mode Spectrum Control Software) programs to send and receive their transmitted signals across the airwaves. These software programs are specifically made to send and receive a modulated signal. So, instead of being forced to play the game by changing the frequency of a transmitter or receiver, a user can alter the modulated signal directly. This makes FMCSA a prime solution for those who need a certain type of modulated radio signal but do not want to change their hardware to get it.