Frequency of Radio Waves
The radiofrequency spectrum is a natural and limited resource. Radio waves are a means of transmitting information from one point to another without the use of media.
One of the most important characteristics of any waves is their wavelength or frequency of radio waves.
The frequency of radio waves determines the position in the radio frequency spectrum and hence all the characteristics of radio wave propagation and potential use.
Because radio waves migrate across state borders and can interfere with other radio waves, there are many rules, frequency programs, and procedures that define how to use the radio frequency spectrum to avoid interference.
Because different frequencies have different properties, some general harmonic frequency bands define the main purpose of the band and the basic technical parameters of transmitters that use these frequencies.
The so-called allocations are accepted at the international level and provide basic rules for the use of frequencies.
Thereafter, each refinement is further refined and states may have special agreements on how to use specific frequencies.
One of the most popular services that use radio frequencies is terrestrial or satellite broadcasting. Radio and television are a well-known and well-established way of transmitting images and sound using radio waves.
Because we usually want large coverage areas with few transmitters we use high power transmitters on high transmission sites. Large coverage areas also mean cross-border coverage.
This is a very important fact because in the same area there can be only one transmitter that can operate at a certain frequency without causing a disturbance.
Of course, there are special cases like digital transmission and individual frequency networks where nearby transmitters operate at the same frequency without causing interference, but for analog transmission careful frequency planning is mandatory.
For frequency bands, there are many special regional agreements that very precisely define certain frequencies assigned to each state, procedures that will be used to change the program, and also many rules that must be respected to prevent interference.
When we want to listen to a particular radio we need to know how often that radio transmits.
Frequency is like a street address where each house has its own number. As for TV, this is true.
However, for practical reasons, we usually do not work with frequencies directly, but we use channels where each number of channels represents one (central) frequency with the same channel bandwidth.
In general, most consumers are unaware of all the technical details that regulate the use of frequencies and are used to provide many wireless services.
They only expect good music, quality movies, and mobile phones that work everywhere.