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ABC Western Queensland
ABC Western Queensland is an ABC Local Radio station based in Longreach broadcasting to the Central West, South West and Gulf regions of Queensland. It covers a wide area stretching as far as the towns of Charleville, Winton and Birdsville. The station began broadcasting as 4QL in 1947 on 690 AM, originally as a relay of the national program. Studios were then built and local programs began in 1952. ABC Western Queensland now broadcasts through the following main AM transmitters along with a number of low-power FM repeaters: *4QL 540 AM *4CH 603 AM During the late 1980s the NERR (North East Regional Radio) satellite service was established. This allowed 'black spots' to be filled in, supplementing the Longreach and Charleville transmitters. Program is fed via satellite to receivers in remote places like Birdsville or Karumba and then re-transmitted via a small FM transmitter to that town. References See also * List of radio stations in Australia {{DEFAULTSORT:ABC We ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kilohertz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that one hertz is the reciprocal of one second. It is named after Heinrich Rudolf Hertz (1857–1894), the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz are commonly expressed in multiples: kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz). Some of the unit's most common uses are in the description of periodic waveforms and musical tones, particularly those used in radio- and audio-related applications. It is also used to describe the clock speeds at which computers and other electronics are driven. The units are sometimes also used as a representation of the energy of a photon, via the Planck relation ''E'' = ''hν'', where ''E'' is the photon's energy, ''ν'' is its frequen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amplitude Modulation
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied, as in frequency modulation, or its phase, as in phase modulation. AM was the earliest modulation method used for transmitting audio in radio broadcasting. It was developed during the first quarter of the 20th century beginning with Roberto Landell de Moura and Reginald Fessenden's radiotelephone experiments in 1900. This original form of AM is sometimes called double-sideband amplitude modulation (DSBAM), because the standard method produces sidebands on either side of the carrier frequency. Single-sideband modulation uses bandpass filters to eliminate one of the sidebands and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
