A method of communicating over a distance by modulating electromagnetic waves by means of an intelligence bearing-signal and radiating these modulated waves by means of transmitter and a receiver. A device or pertaining to a device, that transmits or receives electromagnetic waves in the frequency bands that are between 10kHz and 3000 GHz. Telecommunication by modulation and radiation of electromagnetic waves. A transmitter, receiver, or transceiver used for communication via electromagnetic waves. A general term applied to the use of radio waves.
Modulation is a two part process, a current called the carrier, and a signal bearing information.
We generate a continuous, high frequency carrier wave, and then we modulate or vary that current with the signal we wish to send. Amplitude means strength. A.M. means a carrier wave is modulated in proportion to the strength of a signal. The carrier rises and falls instantaneously with each high and low of the conversation. The voice current, in other words, produces an immediate and equivalent change in the carrier.