Author Archive

10, February 2017

Data (digital radio)

Most new radio systems are digital, including digital television, satellite radio and digital audio broadcasting. The earliest form of digital broadcasting was a telegraph spark, used by pioneers such as Marconi. By pressing the key, the operator can send messages in Morse code by activating a rotating sizzle switch. The rotary switch is a toneRead More …

10, February 2017

History of Radio and Communication Systems

A radio communication system sends radio signals. The types of deployed radio systems depend on technology, standards, regulations, allocation of radio spectrum, user needs, positioning service and investment. The radio equipment involved in the communication systems comprises a transmitter and a receiver each having an antenna and the appropriate terminal equipment, such as a microphoneRead More …

10, February 2017

Transmitter and modulation

Each system comprises a transmitter which consists of a current source, producing an alternating desired frequency of oscillation. The transmitter contains a system for modulating (selecting) certain goods of the generated energy to print a sign on it. This modulation can be as simple as transforming energy or modifying more subtle properties such as amplitude,Read More …

10, February 2017

Radio

Radio is the technology using radio waves to carry information, such as sound, systematically modulating the properties of waves of electromagnetic energy transmitted through space, such as amplitude, frequency, phase or Pulse width. When radio waves have reached an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information contained inRead More …