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The 2-meter amateur radio band is a portion of the VHF radio spectrum that comprises frequencies stretching from 144 MHz to 148 MHz [1] in International Telecommunication Union region (ITU) Regions 2 (North and South America plus Hawaii) and 3 (Asia and Oceania) [2] [3] and from 144 MHz to 146 MHz in ITU Region 1 (Europe, Africa, and Russia).
The 2 200 metre band is available for use in several countries, and the 2007 World Radiocommunication Conference (WRC-07) recommended it as a worldwide amateur allocation. Before the introduction of the 2 200 metre band in the U.K. in 1998, operation on the even lower frequency of 73 kHz, in the LF time signal band, was allowed from 1996–2003.
Printable version; Page information; ... United States radio spectrum frequency allocations chart as of January 2016. ... Version of PDF format: 1.4
The first signal report format code may have been QJS. [citation needed]The U.S. Navy used R and K signals starting in 1929. [citation needed]The QSK code was one of the twelve Q Codes listed in the 1912 International Radiotelegraph Convention Regulations, but may have been in use earlier.
CW [2] Frequency Amateur band; 1.8025 MHz 160 meters: 3.5815 MHz 80 meters: 7.0475 MHz 40 meters: 14.0475 MHz 20 meters: 18.0975 MHz 17 meters: 21.0675 MHz 15 meters: 28.0675 MHz 10 meters: 50.350 MHz 6 meters: 147.555 MHz 2 meters
Morse code is called the original digital mode. Radio telegraphy, designed for machine-to-machine communication is the direct on / off keying of a continuous wave carrier by Morse code symbols, often called amplitude-shift keying or ASK, may be considered to be an amplitude modulated mode of communications, and is rightfully considered the first digital data mode.
2,304.1 MHz Region 2 CW & SSB calling frequency [2]; 2,320.2 MHz Region 1 Narrow-band calling frequency [3]; 2.400–2.485 GHz: Spread Spectrum band for general radio-controlled aircraft recreational use (amateur radio license holders have 2.39–2.45 GHz licensed for their general use in the USA) and using both frequency-hopping spread spectrum and direct-sequence spread spectrum RF ...
Shortwave bands are frequency allocations for use within the shortwave radio spectrum (the upper medium frequency [MF] band and all of the high frequency [HF] band). Radio waves in these frequency ranges can be used for very long distance (transcontinental) communication because they can reflect off layers of charged particles in the ionosphere and return to Earth beyond the horizon, a ...