radar
radar
radar
The source is the RF current in the transmitting antenna.
RADAR (RAdio Detection And Ranging)
Radar locates objects with radio waves.
It has to always be broadcasting radio waves otherwise no devices will ever find the router.
Radio waves are generated and modulated with the transmitted information at the transmitting station and radiated by its antenna. These radio waves are picked up by the receiver antenna, filtered from all the other transmitted signals, detected and demodulated by the receiver to recover the transmitted information.
The question's meaning is mysterious. Radio signals AREelectromagnetic waves,specifically those in the band of frequencies/wavelengths known as "radio waves".That's exactly what is physically transmitted. Between the transmitting antennaand the receiving antenna, the energy of the radio signal, and the informationencoded in it, travels in the form of electromagnetic waves.
RF stands for Radio Frequency, magnetic waves radiate out of the transmitting antenna and are picked up or recovered by the receiving antenna at the receiver.
Radio waves are controlled by the people who operate transmitting devices and by the laws of nature, not by the government. The government controls access to the privilege of operating transmitting devices. If that access were not controlled, the entire radio spectrum would sound like the 27 MHz 'citizen's band', and nobody would get any productive use out of it. Including would-be police, fire, ambulance, and cellphone users.
Amplitude Modulation and Frequency Modulation. They are different methods of transmitting radio signals. AM is good for transmitting radio signals long distance FM is good for transmitting radio signals short distances but better quality