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Blue Ridge-class Command Ship
The ''Blue Ridge'' class is the first and only class of amphibious command and control ships to be specifically designed as such from the keel up. The ''Blue Ridge'' class resulted from almost seven years of planning and construction work. Under the designation SCB-248 (later SCB-400.65), the hull of the Iwo Jima-class amphibious assault ship was used as the basis of the design due to the flight deck's ability to distance antennas to minimize interference between the ships' multiple communications systems and to the deck's ability to act as a ground plane; the LPH island was replaced with a small centralized superstructure. As designed, the ''Blue Ridge'' class was capable of supporting the staff of both the Commander of an Amphibious Task Force and the staff of the Commanding General of the Landing Force. The ships were the most advanced joint amphibious command-and-control centers constructed at the time, due to their advanced computer systems, extensive communications pac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Mount Whitney (LCC-20)
USS ''Mount Whitney'' (LCC/JCC 20) is one of two amphibious command ships of the United States Navy and is the flagship and command ship of the United States Sixth Fleet. USS ''Mount Whitney'' also serves as the Afloat Command Platform (ACP) of Naval Striking and Support Forces NATO (STRIKFORNATO). The ship had previously served for years as the COMSTRIKFLTLANT(NATO Designation) / US Second Fleet's command ship. She is one of only a few commissioned ships to be assigned to Military Sealift Command. ''Mount Whitney'' was classified as LCC-20 on 1 January 1969, and her keel was laid down on 8 January by Newport News Shipbuilding & Drydock Company, Newport News, Virginia. At the time of her commissioning, ''Mount Whitney'' joined her sister ship ''Blue Ridge'' as having the distinction of carrying the world's most sophisticated electronics suites. It was said to be some thirty percent larger than that of the aircraft carrier USS ''John F. Kennedy'', which had been the most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Frequency
High frequency (HF) is the International Telecommunication Union, ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decametre, decameters (ten to one hundred meters). Frequencies immediately below HF are denoted medium frequency (MF), while the next band of higher frequencies is known as the very high frequency (VHF) band. The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called shortwave radio. Because radio waves in this band can be reflected back to Earth by the ionosphere layer in the atmosphere – a method known as "skip" or "skywave" propagation – these frequencies are suitable for long-distance communication across intercontinental distances and for mountainous terrains which prevent Line-of-sight propagation, line-of-sight communica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M242 Bushmaster
The M242 Bushmaster chain gun is a 25 mm (25×137mm) single-barrel chain-driven autocannon. It is used extensively by the U.S. military, such as in the Bradley fighting vehicle, as well as by other NATO members and some other nations in ground combat vehicles and various watercraft. Hughes Helicopters in Culver City, California was the original designer and manufacturer. McDonnell Douglas Helicopters acquired Hughes Helicopters in 1985, and merged into Boeing Corporation in 1997. In 2002, it was sold again to Alliant Techsystems, which merged with Orbital Sciences Corporation in 2015 to form Orbital Science ATK and was, in turn, bought out by Northrop Grumman in 2018. , Northrop Grumman Innovation Systems produces the gun. It is an externally powered, chain-driven, single-barrel weapon, that may be fired in semi-automatic, burst, or automatic modes. It is fed by a metallic link belt and has dual-feed capability. The term "chain gun" derives from the use of a roller cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mark 38 25 Mm Machine Gun System
The Mark 38 25 mm Machine Gun System (MGS) is a shipboard weapon system designed to protect warships primarily from a variety of surface threats, especially small, fast surface craft. It consists of an M242 Bushmaster chain gun mounted on a turret that can be either manually or remote controlled, depending on variant. Originally designed by the United States in the 1980s for use on their warships, the Mark 38 is today in service on warships of various NATO countries. Description The Mark 38 25 mm MGS provides ships with short-range capability against High-Speed Maneuvering Surface Targets (HSMSTs), floating mines, and enemy swimmers. Ships close to land can use the system against enemy personnel and lightly armored vehicles. It is a low-cost weapon that can operate in any weather condition, day or night. The Mk 38 MGS can be permanently or temporarily installed on warships for their deployment requirements. The initial variants of the Mark 38, Mods 0 and 1, were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phalanx CIWS
The Phalanx CIWS (often spoken as "sea-wiz") is a gun-based close-in weapon system to defend military watercraft automatically against incoming threats such as aircraft, missiles, and small boats. It was designed and manufactured by the General Dynamics Corporation, Pomona Division,Thomas, Vincent C. ''The Almanac of Seapower 1987'' Navy League of the United States (1987) p.191 later a part of Raytheon. Consisting of a radar-guided Vulcan cannon mounted on a swiveling base, the Phalanx has been used by the United States Navy and the naval forces of 15 other countries. The US Navy deploys it on every class of surface combat ship, except the and . Other users include the British Royal Navy, the Royal Australian Navy, the Royal New Zealand Navy, the Royal Canadian Navy and the US Coast Guard (aboard its - and s). A land variant, the LPWS (Land Phalanx Weapon System), part of the C-RAM system, was developed. It was deployed to counter rocket, artillery and mortar attack ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RIM-7 Sea Sparrow
RIM-7 Sea Sparrow is a U.S. ship-borne short-range anti-aircraft and anti-missile weapon system, primarily intended for defense against anti-ship missiles. The system was developed in the early 1960s from the AIM-7 Sparrow air-to-air missile as a lightweight "point-defense" weapon that could be retrofitted to existing ships as quickly as possible, often in place of existing gun-based anti-aircraft weapons. In this incarnation, it was a very simple system guided by a manually aimed radar illuminator. After its introduction, the system underwent significant development into an automated system similar to other US Navy missiles like the RIM-2 Terrier. Contemporary improvements being made to the Sparrow for the air-to-air role led to similar improvements in the Sea Sparrow through the 1970s and 80s. After that point the air-to-air role passed to the AIM-120 AMRAAM and the Sea Sparrow underwent a series of upgrades strictly for the naval role. It now resembles the AIM-7 only in ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3"/50 Caliber Gun
The 3"/50 caliber gun (spoken "three-inch fifty-caliber") in United States naval gun terminology indicates the gun fired a projectile in diameter, and the barrel was 50 calibers long (barrel length is 3 in × 50 = ). Different guns (identified by Mark numbers) of this caliber were used by the U.S. Navy and U.S. Coast Guard from 1890 through to 1994 on a variety of combatant and transport ship classes. The gun is still in use with the Spanish Navy on ''Serviola''-class patrol boats. Early low-angle guns The US Navy's first 3"/50 caliber gun (Mark 2) was an early model with a projectile velocity of per second. Low-angle (single-purpose/non-anti-aircraft) mountings for this gun had a range of 7000 yards at the maximum elevation of 15 degrees. The gun entered service around 1900 with the s, and was also fitted to s. By World War II these guns were found only on a few Coast Guard cutters and Defensively Equipped Merchant Ships. Low-angle 3"/50 caliber guns (Marks 3, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue Ridge Transiting The Strait Of Magellan, File 08 Of 10
Blue is one of the three primary colours in the RYB colour model (traditional colour theory), as well as in the RGB (additive) colour model. It lies between violet and cyan on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called Tyndall effect explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective. Blue has been an important colour in art and decoration since ancient times. The semi-precious stone lapis lazuli was used in ancient Egypt for jewellery and ornament and later, in the Renaissance, to make the pigment ultramarine, the most expensive of all pigments. In the ei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discone Antenna
A discone antenna is a version of a biconical antenna in which one of the cones is replaced by a disc. It is usually mounted vertically, with the disc at the top and the cone beneath. Omnidirectional, vertically polarized and with gain similar to a dipole, it is exceptionally wideband, offering a frequency range ratio of up to approximately 10:1. The radiation pattern in the vertical plane is quite narrow, making its sensitivity highest in the direction of the horizon and rather less for signals coming from relatively close by. History On February 6, 1945, Armig G. Kandoian of New York City was awarded U.S. patent number (assignor to Federal Telephone and Radio Corporation, later merged with ITT Corporation), from an application made on May 15, 1943. Excerpt from the Kandoian patent: In keeping with progress made during the last few years in the development of ultra-high frequency radio technique, and applications thereof to aircraft communication, direction finding, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Longwire Antenna
A random wire antenna is a radio antenna consisting of a long wire suspended above the ground, whose length does not bear a particular relation to the wavelength of the radio waves used, but is typically chosen more for convenience. The wire may be straight or it may be strung back and forth between trees or walls just to get enough wire into the air. Due to the great variability of the (unplanned) antenna structure, effectiveness can vary wildly from one installation to another. Random wire antennas are typically fed at one end against a suitable counterpoise (such as earth ground). They are widely used as receiving antennas on the long wave, medium wave, and short wave bands, as well as transmitting antennas on these bands for small outdoor, temporary or emergency transmitting stations, as well as in situations where more permanent antennas cannot be installed. Random wire and long wire Often random wire antennas are also (inaccurately) referred to as long-wire antenna. Act ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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