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WRHC (AM)
WRHC (1550 kHz) is an AM radio station with a Spanish language talk radio format, simulcasting WWFE. Licensed to serve Coral Gables, Florida, United States, the station reaches the Miami metropolitan area. The station is currently owned by Salem Media Group. The station's name and broadcast callsign are an homage to the former Cuban radio network, RHC-Cadena Azul, which operated from 1939 until 1954. Previously known as WRIZ until 1985, the station had a phased array of four radio towers in Stiltsville south of Key Biscayne from 1967 to 1990. Because salt water is highly conductive, it makes an excellent ground plane for signals in the mediumwave radio band, allowing the station to travel farther on the same power, although this station's purpose was to put a strong signal across Miami while minimizing its signal toward the Bahamas Islands and a station on 1540.. As with all medium-frequency stations, the towers themselves were mast radiators, connected to the transmitter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WWFE
WWFE (670 AM), known as "La Poderosa", is a commercial radio station in Miami, Florida, broadcasting to the Miami-Fort Lauderdale area. WWFE has a Spanish language talk radio format, with an emphasis on Cuban news and music. The radio studios and offices are on SW 27th Avenue in Miami. By day, WWFE is powered at 50,000 watts, the maximum for commercial AM stations. Because 670 AM is a United States clear channel frequency, WWFE must reduce nighttime power to 1,000 watts to prevent interference to the skywave signal of WSCR in Chicago, which is the principal Class A station on 670 AM. (The other Class A station on this frequency is KDLG in Dillingham, Alaska.) WWFE broadcasts from a directional antenna at all times, with a six-tower array used at night. In , WWFE signed on the air. In 2022, WWFE was purchased by Salem Media Group Salem Media Group, Inc. (NASDAQ: SALM; formerly Salem Communications Corporation) is an American radio broadcaster, Internet content pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Broadcast Callsign
Broadcast call signs are call signs assigned as unique identifiers to radio stations and television stations A television station is a set of equipment managed by a business, organisation or other entity, such as an amateur television (ATV) operator, that transmits video content and audio content via radio waves directly from a transmitter on the earth .... While broadcast radio stations will often brand management, brand themselves with plain-text names, identities such as "cool jazz, cool FM radio, FM", "rock and roll, rock 105" or "the ABC network" are not globally unique. Another station in another city or country may (and often will) have a similar brand, and the name of a broadcast station for legal purposes is normally its internationally recognised ITU call sign. Some common conventions are followed around the world. North America Broadcast stations in North America generally use callsigns in the international series. United States In the United States, the first let ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mast Radiator
Mast, MAST or MASt may refer to: Engineering * Mast (sailing), a vertical spar on a sailing ship * Flagmast, a pole for flying a flag * Guyed mast, a structure supported by guy-wires * Mooring mast, a structure for docking an airship * Radio masts and towers , towers that carry antennas * The primary support for a helicopter rotor * The main vertical structure of a forklift truck * Multi-axis shaker table, an automotive test system * Model for assessment of telemedicine, used to assess long-distance medical treatment Biology * Mast (botany), the edible parts of woody plants * Mast Arboretum, at Stephen F. Austin State University in Nacogdoches, Texas * Mast cell, involved in the allergy response * Mast., in botanical naming, the standard author abbreviation for Maxwell T. Masters * Two microtubule-associated serine/threonine-protein kinase enzymes: ** MAST1, an enzyme that in humans is encoded by the ''MAST1'' gene ** MAST2, an enzyme that in humans is encoded by the ''MAST ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Band
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 0 Hz to 3,000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio waves is strictly regulated by national laws, coordinated by an international body, the International Telecommunication Union (ITU). Different parts of the radio spectrum are allocated by the ITU for different radio transmission technologies and applications; some 40 radiocommunication services are defined in the ITU's Radio Regulations (RR). In some cases, parts of the radio spectrum are sold or licensed to operators of private radio transmission services (for example, cellular telephone operators or broadcast television stations). Ranges of allocated frequencies are often referred to by their provisioned use (for example, c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mediumwave
Medium wave (MW) is the part of the medium frequency (MF) radio band used mainly for AM radio broadcasting. The spectrum provides about 120 channels with more limited sound quality than FM stations on the FM broadcast band. During the daytime, reception is usually limited to more local stations, though this is dependent on the signal conditions and quality of radio receiver used. Improved signal propagation at night allows the reception of much longer distance signals (within a range of about 2,000 km or 1,200 miles). This can cause increased interference because on most channels multiple transmitters operate simultaneously worldwide. In addition, amplitude modulation (AM) is often more prone to interference by various electronic devices, especially power supplies and computers. Strong transmitters cover larger areas than on the FM broadcast band but require more energy and longer antennas. Digital modes are possible but have not reached momentum yet. MW was the main radio ban ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ground Plane
In electrical engineering, a ground plane is an electrically conductive surface, usually connected to electrical ground. The term has two different meanings in separate areas of electrical engineering. *In antenna theory, a ground plane is a conducting surface large in comparison to the wavelength, such as the Earth, which is connected to the transmitter's ground wire and serves as a reflecting surface for radio waves. *In printed circuit boards, a ground plane is a large area of copper foil on the board which is connected to the power supply ground terminal and serves as a return path for current from different components on the board. Radio antenna theory In telecommunication, a ''ground plane'' is a flat or nearly flat horizontal conducting surface that serves as part of an antenna, to reflect the radio waves from the other antenna elements. The plane does not necessarily have to be connected to ground to be used as a reflecting surface for radio waves. Ground plane s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrical Conductivity
Electrical resistivity (also called specific electrical resistance or volume resistivity) is a fundamental property of a material that measures how strongly it resists electric current. A low resistivity indicates a material that readily allows electric current. Resistivity is commonly represented by the Greek letter (rho). The SI unit of electrical resistivity is the ohm-meter (Ω⋅m). For example, if a solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is , then the resistivity of the material is . Electrical conductivity or specific conductance is the reciprocal of electrical resistivity. It represents a material's ability to conduct electric current. It is commonly signified by the Greek letter ( sigma), but ( kappa) (especially in electrical engineering) and ( gamma) are sometimes used. The SI unit of electrical conductivity is siemens per metre (S/m). Resistivity and conductivity are inte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seawater
Seawater, or salt water, is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5% (35 g/L, 35 ppt, 600 mM). This means that every kilogram (roughly one liter by volume) of seawater has approximately of dissolved salts (predominantly sodium () and chloride () ions). The average density at the surface is 1.025 kg/L. Seawater is denser than both fresh water and pure water (density 1.0 kg/L at ) because the dissolved salts increase the mass by a larger proportion than the volume. The freezing point of seawater decreases as salt concentration increases. At typical salinity, it freezes at about . The coldest seawater still in the liquid state ever recorded was found in 2010, in a stream under an Antarctic glacier: the measured temperature was . Seawater pH is typically limited to a range between 7.5 and 8.4. However, there is no universally accepted reference pH-scale for seawater and the difference between measurement ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Key Biscayne
Key Biscayne ( es, Cayo Vizcaíno, link=no) is an island located in Miami-Dade County, Florida, located between the Atlantic Ocean and Biscayne Bay. It is the southernmost of the barrier islands along the Atlantic coast of Florida, and lies south of Miami Beach and southeast of Miami. The key is connected to Miami via the Rickenbacker Causeway, originally built in 1947. The northern portion of Key Biscayne is home to Crandon Park, a county park. The middle section of the island consists of the incorporated Village of Key Biscayne. The southern part of the island is now protected as Bill Baggs Cape Florida State Park, adjacent to Biscayne National Park, one of the two national parks in Miami-Dade County. Geography Key Biscayne, although named a "key", is not geologically part of the Florida Keys, but is a barrier island composed of sand eroded from the Appalachian Mountains, carried to the coast by rivers and then moved along the coast from the north by coastal currents. There ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stiltsville
Stiltsville is a group of wood stilt houses located one mile south of Cape Florida, on sand banks of the Safety Valve on the edge of Biscayne Bay in Miami-Dade County, Florida. The structures stand on wood or reinforced concrete pilings, generally ten feet above the shallow water, which varies from one to three feet deep at low tide. History Most sources claim the first stilt shack was built in the early 1930s, but some Dade County historians say that there were a dozen shacks in "the flats" as early as 1922. Crawfish Eddie "Crawfish" Eddie Walker built a shack on stilts above the water in 1933, toward the end of the prohibition era, allegedly to facilitate gambling, which was legal at one mile offshore. Crawfish Eddie sold bait and beer from his shack and was known for a dish he called ''chilau'', a crawfish chowder made with crawfish he caught under his shack. Thomas Grady and Leo Edward, two of Eddie's fishing buddies, built their own shack in 1937. Shipwrecking and chann ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Tower
Radio masts and towers are typically tall structures designed to support antennas for telecommunications and broadcasting, including television. There are two main types: guyed and self-supporting structures. They are among the tallest human-made structures. Masts are often named after the broadcasting organizations that originally built them or currently use them. In the case of a mast radiator or radiating tower, the whole mast or tower is itself the transmitting antenna. Terminology The terms "mast" and "tower" are often used interchangeably. However, in structural engineering terms, a tower is a self-supporting or cantilevered structure, while a mast is held up by stays or guys. Broadcast engineers in the UK use the same terminology. A mast is a ground-based or rooftop structure that supports antennas at a height where they can satisfactorily send or receive radio waves. Typical masts are of steel lattice or tubular steel construction. Masts themselves play no part in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phased Array
In antenna theory, a phased array usually means an electronically scanned array, a computer-controlled array of antennas which creates a beam of radio waves that can be electronically steered to point in different directions without moving the antennas. In a simple array antenna, the radio frequency current from the transmitter is fed to multiple individual antenna elements with the proper phase relationship so that the radio waves from the separate elements combine ( superpose) to form beams, to increase power radiated in desired directions and suppress radiation in undesired directions. In a phased array, the power from the transmitter is fed to the radiating elements through devices called ''phase shifters'', controlled by a computer system, which can alter the phase or signal delay electronically, thus steering the beam of radio waves to a different direction. Since the size of an antenna array must extend many wavelengths to achieve the high gain needed for narrow bea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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