Marine Vhf Radio

Clarifications

1) " Marine" -- As it applies to Marine Vhf Radio Contents 1 France 2 Science Fiction Marines 3 Sea terms and naval usage 4 Naval infantry France Marines is the name of a commune inthe département of Val d'Oise, France. Science Fiction Marines Space Marines United States Colonial Marines Sea terms and naval usage Marine is a general term for things relating to the ocean, as with Marine biology, Marine geology, and as a term for a navy, etc. The Royal Netherlands Navy is called theKoninklijke Marine in Dutch, not to be confused with the Royal Netherlands Marine Corps (also called Dutch Marine Corps, in Dutch Korps Mariniers ), which is part ofit. The Deutsche Marine is the modern German navy. Naval infantry Marines are naval infantry, specialising in fighting on ships and conducting amphibious assaults. Marines are usually a branch of acountry's navy, often designated a corps ratherthan a service. Note that some countries do not differentiate branches of their armed forces, as Israeli Defense Forces, Canadian Armed Forces. See also Corps of Colonial Marines - Formed by the British during the mid 1840's to serve in the remaining British America colonies (mainly the West Indies ), The Colonial Marines were controlled by the Royal Marines as an auxiliary force. initially recruited from freed or escapedslaves from the United States and later by local inhabitants. These units were either disbanded or absorbed by the West Indies Regiment French Marines two typesof French Marines exist, French Army units which were formerly titled Colonial Troops and were army troops who wore and anchor patch and servedoverseas, but were the responsibility of the French Navy for administration. Nowadays, Marine troops consist Marine Infantry( Infanterie de Marine ), Marine Artillery ( Artillerie de Marin... 2) " Vhf" -- As it applies to Marine Vhf Radio Very high frequency (VHF) is the radio frequency range from30 MHz (wavelength 10 m ) to 300 MHz (wavelength 1 m ). Common uses for VHF are FM radio broadcast at 88-108 MHz and television broadcast (together with UHF ). VHF is also commonly used for terrestrial navigation systems ( VOR in particular) and aircraft communications. The general description of frequencies immediately below VHF is HF,and the next higher frequencies are known as Ultra highfrequency (UHF). UHF and VHF are the most common frequency bands for television. VHF frequencies' propagation characteristics are ideal for short-distance terrestrial communication, with a range generallysomewhat farther than line-of-sight from the transmitter (see formula below). Unlike high frequencies (HF), the ionosphere doesnot usually reflect VHF radio and thus transmissions are restricted to the local area (and don't interfere with transmissionsthousands of kilometres away). VHF is also less affected by atmospheric noise and interference from electrical equipment than lowfrequencies. Whilst it is more easily blocked by land features than HF and lower frequencies, it is less bothered by buildingsand other less substantial objects than higher frequencies. Two unusual propagation conditions can allow much farther range than normal. The first, tropospheric ducting, can occur infront of and parallel to an advancing cold weather front, especially if there is a marked difference in humidities between thecold and warm air masses. A duct can form approximately 150 miles (240 km.) in advance of the cold front, much like a ventilationduct in a building, and VHF radio frequencies can travel along inside the duct, bending or refracting, for hundreds of miles. Forexample, a 50-watt Amateur FM transmitter at 146 MHz can talk from Chicago IL to Joplin MO directly, and to Austin TX through arepeater. The second type, much more rare, is called Sporadic-E, referring to the E-laye... 3) " Radio" -- As it applies to Marine Vhf Radio Old fashioned radio, Truetone model For other uses see: radio(disambiguation) Radio is a technology that allows the transmission of signals by modulation of electromagneticwaves with frequencies below those of light. Contents 1 Radio waves 2 Discovery 3 Invention and history 4 Uses of radio 5 See also 6 External links Radio waves Radio waves are a form of electromagnetic radiation, and are created whenever a charged object accelerates with a frequency that lies inthe radio frequency (RF) portion of the electromagnetic spectrum. This is the range from a few tensof hertz to a few gigahertz. Electromagnetic radiation travels (propagates) by means ofoscillating electric and magnetic fields that pass through the air and the vacuum of space equally well, and does not require amedium of transport. By contrast, other types of electromagnetic radiation, with frequencies above the RF range are gamma rays, X-rays, and infrared, ultraviolet and visible light. When radio waves pass a wire, their oscillating electric or magnetic field (depending on the shape of the wire) induces analternating current and voltage in the wire. This can be transformed into audio or other signals that carry information. Althoughthe word 'radio' is used to describe this phenomenon, the transmissions which we know as television, radio, radar, and cell phone are all in theclass of radio frequency emissions. Radio spectrum ELF | SLF | ULF | VLF | LF / LW | MF / MW | HF / SW | 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 | 300 GHz Discovery The theoretical basis of the propagation of electromagnetic waves was first described in 1873 by James Clerk Maxwell in his paper to the Royal Society A dynamical theory of the electromagnetic f... 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