FACTOID # 1: Idaho produces more milk than Iowa, Indiana and Illinois combined.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Mediumwave" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Mediumwave

Mediumwave radio transmissions serves as the most common band for broadcasting. The standard AM broadcast band is 525 kHz to 1715 kHz in North America, but remains only up to 1615 kHz elsewhere. This article or section is missing references or citation of sources. ... AM radio is radio broadcasting using Amplitude Modulation. ... World map showing North America A satellite composite image of North America. ...


In the Americas, mediumwave stations are separated by 10 kHz and have two sidebands of ±5 kHz. In the rest of the world, the separation is 9 kHz, with sidebands of ±4.5 kHz. Both provide adequate audio quality for voice, but are insufficient for high-fidelity broadcasting, which is common on the VHF FM bands. In the US the maximum transmitter power is restricted to 50 kilowatts, while in Europe there are medium wave stations with transmitter power up to 2.5 megawatts. World map showing the Americas The Americas are the lands of the Western hemisphere consisting of the continents of North America and South America with their associated islands and regions. ... In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, containing energy as a result of the modulation process. ... Human voice consists of sound made by a person using the vocal folds for talking, singing, laughing, screaming or crying. ... High fidelity or hi-fi reproduction is a quality standard that means the reproduction of sound or images is very faithful to the original. ... Very high frequency (VHF) is the radio frequency range from 30 MHz (wavelength 10 m) to 300 MHz (wavelength 1 m). ... Frequency modulation (FM) is a form of modulation which represents information as variations in the instantaneous frequency of a carrier wave. ... Europe is conventionally considered one of the seven continents of Earth which, in this case, is more a cultural and political distinction than a physiographic one, leading to various perspectives about Europes borders. ...


Mediumwave signals have the property of following the curvature of the earth (the groundwave) at all times, and also reflecting off the ionosphere at night (skywave). This makes this frequency band ideal for both local and continent-wide service, depending on the time of day. For example, during the day a radio receiver in the state of Maryland is able to receive reliable but weak signals from high-power stations WFAN, 660 kHz, and WOR, 710 kHz, 400 km away in New York City, due to groundwave propagation. The effectiveness of groundwave signals largely depends on ground conductivity—higher conductivity results in better propagation. At night, the same receiver picks up signals as far away as Mexico City and Chicago reliably. Groundwave is the propagation of radio waves close to the surface of the Earth. ... Relationship of the atmosphere and ionosphere The ionosphere is the part of the atmosphere that is ionized by solar radiation. ... It has been suggested that this article or section be merged with Ionosphere. ... Official language(s) None (English, de-facto) Capital Annapolis Largest city Baltimore Area  Ranked 42nd  - Total 12,417 sq. ... Sportsradio 66 WFAN AM 660 kHz, often referred to as The FAN, is a radio station in New York City. ... WOR-AM is a class A (nighttime clear channel), AM radio station located in New York, New York, USA, operating on 710kHz. ... Flag Seal Nickname: The Big Apple, The Capital of the World[1], Gotham Location Location in the state of New York Government Counties (Boroughs) Bronx (The Bronx) New York (Manhattan) Queens (Queens) Kings (Brooklyn) Richmond (Staten Island) Mayor Michael Bloomberg (R) Geographical characteristics Area    - City 1,214. ... Mexico City (Spanish: Ciudad de México, México D.F. or simply México, pronounced /mexiko/ in IPA) is the capital and largest city of the nation of Mexico. ... Flag Seal Nickname: The Windy City Motto: Urbs In Horto (Latin: City in a Garden), I Will Location Location in Chicagoland Government Country State Counties United States Illinois Cook, DuPage Mayor Richard M. Daley (D) Geographical characteristics Area    - City 606. ...


Many North American stations are required to shut down or reduce power at night in order to make way for clear channel stations that can then be received over a wider range. Clear channel stations are AM radio stations that are designated as such so that only one or two 50,000 watt powerhouses operate at night on each designated frequency, covering a wide area via sky wave propagation. ...


In Europe, each country is allocated a number of frequencies on which high power (up to 2.5 MW) can be used; the maximum power is also subject to international agreement. Other countries may only operate low-powered transmitters on the same frequency, again subject to agreement. For example, Russia operates a high-powered transmitter, located in its Kaliningrad exclave and used for external broadcasting, on 1323 kHz. The same frequency is also used by low-powered local radio stations in England; other parts of England can still receive the Russian broadcast. International mediumwave broadcasting in Europe has decreased markedly with the end of the Cold War and the increased availability of satellite and Internet TV and radio, although the cross-border reception of neighbouring countries' broadcasts by expatriates and other interested listeners still takes place. Map of Kaliningrad Oblast Kaliningrad (Russian: ), until 1945 known by its German name Königsberg, then briefly as Kenigsberg (Russian: Кёнигсберг), is a seaport city, capital and main city of the Kaliningrad Oblast, the Russian exclave between Poland and Lithuania on the Baltic Sea. ... D is Bs exclave, but is not an enclave. ... Royal motto (French): Dieu et mon droit (Translated: God and my right) Englands location (dark green) within the United Kingdom (light green), with the Republic of Ireland (blue) to its west Languages English Capital London Largest city London Area – Total Ranked 1st UK 130,395 km² Population – Total (mid... The Cold War was the protracted geopolitical, ideological, and economic struggle that emerged after World War II between the global superpowers of the Soviet Union and the United States, supported by their alliance partners. ...


Due to the high demand for frequencies in Europe, many countries operate single frequency networks; in Britain, BBC Radio 5 broadcasts from various transmitters on either 693 or 909 kHz. These transmitters are carefully synchronised to minimise interference from more distant transmitters on the same frequency. BBC Radio Five Live is the radio service providing live BBC News, phone-ins, and sports commentaries. ...


Stereo transmission is possible and offered by some stations in the U.S., Canada, Australia, South Africa, and France. However, there are multiple standards for AM stereo with C-QUAM being the legally-permitted one in the United States, and receivers that implement the technologies are relatively rare but not uncommon. Another well-known system, which is no longer used, is Kahn Powerside. AM stereo is any of a number of mutually-incompatible techniques for broadcasting two_channel audio in the mediumwave band in a manner that is compatible with receivers designed for standard amplitude modulation. ... C-QUAM is the method of AM stereo broadcasting used in Canada, the United States and most other countries. ...


In September 2002, the United States Federal Communications Commission approved the iBiquity in-band on-channel (IBOC) system of digital audio broadcasting, which is meant to improve the audio quality of signals. The Digital Radio Mondiale (DRM) IBOC system has been approved by the ITU for use outside the Americas. Look up September in Wiktionary, the free dictionary. ... For album titles with the same name, see 2002 (album). ... The FCCs official seal. ... iBiquity is a company formed by the merger of USA Digital Radio and Lucent Digital Radio, with the goal of creating an in-band on-channel (IBOC) digital radio system for the United States. ... In-band on-channel (IBOC) is a method of transmitting digital radio and analog radio broadcast signals simultaneously on the same frequency. ... Digital audio broadcasting or DAB is a fairly new technology for broadcasting audio programming in digital form that was designed in the late 1980s. ... Digital Radio Mondiale (DRM) is an international non-profit consortium committed to designing and implementing an open-source platform for digital radio broadcasting around the world, especially on shortwave. ... Monument in Bern, Switzerland. ...

Contents


Antennas

As aerials mostly mast radiators are used. Stations broadcasting with low power commonly use masts with heights of a quarter wavelength, while high power stations mostly use half wavelength. The usage of masts longer than 5/8 of radiated wavelength gives a bad radiation pattern. Usually mast antennas are insulated against ground and show a high voltage against ground during transmission, which complicates maintenance, installation of air safety warning lights or using the mast as a tower for UHF/VHF-radio, but there are several ways to use grounded masts or towers. A typical mast radiator Base feed: mast is fed from Aerial Tuning Unit on right via conductor to top of brown ceramic insulator. ... The wavelength is the distance between repeating units of a wave pattern. ...

Medium Wave Antenna in Solt (Hungary)
Medium Wave Antenna in Solt (Hungary)

If grounded masts or towers are required, than cage aerials or longwire aerials are used. Another possibility consists of feeding the mast or the tower by cables running from the tuning unit to the guys or crossbars in a certain height. Directional aerials consist of multiple masts, which need not to be from the same height. It is also possible to realize directional aerials for mediumwave with cage aerials where some parts of the cage are fed with a certain phase difference. Image File history File linksMetadata Download high resolution version (1536x2048, 454 KB) Description: Medium Wave Transmitter Antenna in Solt (Hungary) Author: (User:deneb) Source Own work File links The following pages link to this file: Mediumwave Transmitter Solt Metadata This file contains additional information, probably added from the digital camera... Image File history File linksMetadata Download high resolution version (1536x2048, 454 KB) Description: Medium Wave Transmitter Antenna in Solt (Hungary) Author: (User:deneb) Source Own work File links The following pages link to this file: Mediumwave Transmitter Solt Metadata This file contains additional information, probably added from the digital camera...


Other type of aerials sometimes used for mediumwave are T- and L-aerials. The kind used depends on the need for grounded or insulated towers.


In some cases dipole aerials are used, which are spun between two masts or towers. Such aerials radiate toward the sky. The mediumwave transmitter at Berlin-Britz for transmitting RIAS used a cross dipole mounted on five 30.5 metre high guyed masts to transmit the skywave up to the ionosphere at nighttime. A simple half-wave dipole antenna that a shortwave listener might build. ... The Transmitter Berlin-Britz is a broadcasting facility for medium wave, shortwave and FM on the area of a former tree school in Berlin-Britz. ...


Europe's largest antenna park DX 183 is placed in Northern Jutland, Denmark. The well-known German DX'er Wilhelm Herbst has constructed and built the antennas. DXers are welcome to use the facilities.


Non-broadcast use

For most of the 20th century, the radio frequency 500 kHz was reserved world wide as the Morse code international calling and distress frequency for ships on the high seas. The frequency 2182 kHz is still used for this purpose, but employing voice transmission. For most of the 20th century, the radio frequency 500 kHz (known as 600 meters or 500 kc for most of the century, before kilohertz replaced kilocycle) was the international calling and distress frequency for ships on the high seas. ... 1922 Chart of the Morse Code Letters and Numerals Morse code is a method for transmitting information, using standardized sequences of short and long marks or pulses — commonly known as dots and dashes — for the letters, numerals and special characters of a message. ... The radio frequency of 2182 kilohertz (kHz) is the international calling and distress frequency for voice maritime communication (radio telephony) on the marine MF bands. ...


Other services that operate in medium wave include Navtex and the Amateur Radio 160-meter band. The obsolete LORAN-A system used medium wave. NAVTEX is an international automated medium frequency direct-printing service for delivery of navigational and meteorological warnings and forecasts, as well as urgent marine safety information to ships. ... Amateur radio, often called ham radio, is a hobby enjoyed by about 3 million people[1] throughout the world. ... LORAN (LOng RAnge Navigation) is a terrestrial navigation system using low frequency radio transmitters that use the time interval between radio signals received from three or more stations to determine the position of a ship or aircraft. ...


See also

Longwave radio frequencies are those below 500 kHz, which correspond to wavelengths longer than 600 meters. ... Drake R8B communications receiver. ... A Grundig shortwave receiver Shortwave radio operates between the frequencies of 3,000 kHz and 30 MHz (30,000 kHz) and came to be referred to as such in the early days of radio because the wavelengths associated with this frequency range were shorter than those commonly in use at... FM radio is a broadcast technology invented by Edwin Howard Armstrong that uses frequency modulation to provide high-fidelity broadcast radio sound. ... A satellite radio or subscription radio (SR) is a digital radio that receives signals broadcast by communications satellite, which covers a much wider geographical range than terrestrial radio signals. ... See also MW DX Category: Radio spectrum ...

External links

Radio spectrum
ELF SLF ULF VLF LF MF HF VHF UHF SHF EHF
3 Hz 30 Hz 300 Hz 3 kHz 30 kHz 300 kHz 3 MHz 30 MHz 300 MHz 3 GHz 30 GHz
30 Hz 300 Hz 3 kHz 30 kHz 300 kHz 3 MHz 30 MHz 300 MHz 3 GHz 30 GHz 300 GHz


Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna. ... Extremely low frequency (ELF) is the band of radio frequencies from 3 to 30 Hz. ... Super Low Frequency (SLF) is the frequency range between 30 Hertz and 300 Hertz. ... Ultra Low Frequency (ULF) is the frequency range between 300 Hertz and 3000 Hertz. ... Part of the aerial of Transmitter Grimeton Very low frequency or VLF refers to radio frequencies (RF) in the range of 3 to 30 kHz. ... This article is being considered for deletion in accordance with Wikipedias deletion policy. ... Mediumwave radio transmissions (sometimes called Medium frequency or MF) are those between the frequencies of 300 kHz and 3000 kHz. ... High frequency (HF) radio frequencies are between 3 and 30 MHz. ... Very high frequency (VHF) is the radio frequency range from 30 MHz (wavelength 10 m) to 300 MHz (wavelength 1 m). ... This article is about the radio frequency. ... Microwave Slang for small waves, like at a beach, often used by surfers. ... Extremely high frequency is the highest radio frequency band. ...


  Results from FactBites:
 
Mediumwave - Wikipedia, the free encyclopedia (950 words)
In the Americas, mediumwave stations are separated by 10 kHz and have two sidebands of ±5 kHz.
Mediumwave signals have the property of following the curvature of the earth (the groundwave) at all times, and also reflecting off the ionosphere at night (skywave).
The mediumwave transmitter at Berlin-Britz for transmitting RIAS used a cross dipole mounted on five 30.5 metre high guyed masts to transmit the skywave up to the ionosphere at nighttime.
Mediumwave (224 words)
Mediumwave radio broadcasts are those between the frequencies of 500 kHz and 2000 kHz.
Mediumwave signals have the properties of following the curvature of the earth (the groundwave[?]) and reflecting or refracting off the ionosphere at night (skywave).
In the Americas, mediumwave stations are separated by 10 kHz and have two sidebands of +/- 5 kHz.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m