single-sideband
101Quadraphonic sound — 4 channels Quadraphonic label Quadraphonic (or Quadrophonic sometimes Quadrasonic) sound – the most widely used early term for what is now called 4.0 surround sound – uses four channels in which speakers are positioned at the four corners of the… …
102OSCAR — This article is about the satellite. For other uses, see Oscar (disambiguation). OSCAR 1 OSCAR is an acronym for Orbiting Satellite Carrying Amateur Radio. OSCAR series satellites use amateur radio frequencies to facilitate communication between… …
103Field Day — is an annual amateur radio exercise, widely sponsored by IARU regions and member organizations, encouraging emergency communications preparedness among amateur radio operators. In the United States, it is typically the largest single emergency… …
104All American Five — The All American Five was a mass produced, superheterodyne radio receiver with five vacuum tubes first designed and produced in the USA in the 1930s.The radio was called the All American Five because the design represented the majority of radios… …
105Navtex — A NAVTEX receiver prints an incoming message. NAVTEX (Navigational Telex) is an international automated medium frequency direct printing service for delivery of navigational and meteorological warnings and forecasts, as well as urgent marine… …
106Shortwave bands — are frequency allocations for use within the high frequency radio spectrum. They are the primary medium for applications such as marine communication, international broadcasting, and worldwide amateur radio activity because they take advantage of …
107Mobile Telephone Service — The Mobile Telephone Service (MTS) is a pre cellular VHF radio system that links to the Public Switched Telephone Network (PSTN). MTS was the radiotelephone equivalent of land dial phone service. As of 2005[update], only rural and wilderness… …
108Emergency Action Message — An Emergency Action Message (EAM) is a preformatted message that directs nuclear capable forces to execute specific Major Attack Options (MAOs) or Limited Attack Options (LAOs) in a nuclear war. Individual countries or specific regions may be… …
109Meteor burst communications — Meteor scatter propagation as used by SNOTEL Meteor burst communications (MBC), also referred to as meteor scatter communications[1], is a radio propagation mode that exploits the ionized trails of meteors during atmospheric entry to establish… …
110Quik Call I — Listen filename=CEGL DKNP Z.ogg title=Quik Call I description=Two Quik Call I sequences. format=OggQuik Call I, also known as 2+2, is a selective calling method originally used in one way paging receivers. In US fire service use, the tones are… …
