high-frequency communications

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• High frequency — (HF) radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters (ten to one hundred metres). Frequencies immediately below HF are denoted Medium frequency… …   Wikipedia

• High Frequency Active Auroral Research Program — Armes électromagnétiques Science fiction ou Théorie du complot Arme Tesla Pistolet laser Rayon de la mort Torpilles MHD Avion Aurora HAARP Officiellement développées Pistolet à impulsion électronique Canon de Gauss Canon à rails Canon ma …   Wikipédia en Français

• High Frequency Internet Protocol — High Frequency Internet Protocolacronyms: HFIP or HF IP. Usually associated with Automatic Link Establishment and HF radio data communications. HFIP provides protocol layers enabling internet file transfer, chat, web, or email. HFIP commonly uses …   Wikipedia

• High Frequency Active Auroral Research Program — HAARP is often confused with Project HARP, the High Altitude Research Project (a joint project of The Pentagon and the Canadian Department of National Defence).The High Frequency Active Auroral Research Program (HAARP) is an investigation project …   Wikipedia

• High frequency active auroral research program — 62°23′30″N 145°09′00″O / 62.39167, 145.15 …   Wikipédia en Français

• High Frequency Global Communications System — The High Frequency Global Communications System (HF GCS) is a network of single sideband shortwave transmitters of the United States Air Force which is used to communicate with aircraft in flight, ground stations and some United States Navy… …   Wikipedia

• high-frequency (HF) communications — The communications carried out at frequencies between 3 and 30 MHz. HF waves are dependent mostly on reflected sky waves and are affected by ionospheric conditions. HF is used for long range communications. The lower frequencies in this range are …   Aviation dictionary

• high frequency — The frequency band between 3 and 30 MHz. This normally is used for long range air to ground communications …   Aviation dictionary

• Extremely high frequency — Frequency range 30 to 300 GHz ITU Radio Band Numbers 1 2 3 4 5 6 7 8 9 10 …   Wikipedia

• Ultra high frequency — (UHF) designates a range (band) of electromagnetic waves with frequencies between 300 MHz and 3 GHz (3,000 MHz). Also known as the decimeter band or decimeter wave as the wavelengths range from ten to one decimeters. Radio waves with frequencies… …   Wikipedia

• Very high frequency — (VHF) is the radio frequency range from 30 MHz to 300 MHz. Frequencies immediately below VHF are denoted High frequency (HF), and the next higher frequencies are known as Ultra high frequency (UHF). The frequency allocation is done by ITU. Common …   Wikipedia