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President HR2510A, a mobile 10-meter radio, with a Uniden microphone. Being a very wide band in HF terms, many different transmission modes can be found on 10 meters. Morse code and other narrowband modes are found toward the bottom portion of the band, SSB from 28.300 MHz up, and wideband modes ( AM and FM ) are found near the upper part of ...
W1AW transmits bulletins of interest to the amateur radio community in a variety of formats, including single sideband and FM voice, CW , RTTY, MFSK16, and PSK31. [3] These bulletins include notification of significant amateur radio events, including frequencies used to assist in rescue efforts during state or national disasters. [2]
The World Administrative Radio Conference (WARC) bands are three portions of the shortwave radio spectrum used by licensed and/or certified amateur radio operators. They consist of 30 meters (10.1–10.15 MHz), 17 meters (18.068–18.168 MHz), and 12 meters (24.89–24.99 MHz).
10 meter radios ("rigs") are often used with transverters - devices designed to shift a radio's operating frequency range - in order to provide inexpensive access to AM/SSB/CW modes on VHF and higher frequencies. 10 meter rigs can be bought for less than $100 during periods of low sunspot activity.
Information in this chart supersedes that in File:United States Frequency Allocations Chart 2011 - The Radio Spectrum.pdf. Archived at archive.org on 2016-10-30. Licensing
As a matter of convention, the ITU divides the radio spectrum into 12 bands, each beginning at a wavelength which is a power of ten (10 n) metres, with corresponding frequency of 3×10 8−n hertz, and each covering a decade of frequency or wavelength. Each of these bands has a traditional name.
The International Telecommunication Union defines frequency allocation as being of "a given frequency band for the purpose of its use by one or more terrestrial or space radiocommunication services or the radio astronomy service under specified conditions". [2] Frequency allocation is also a special term, used in national frequency ...
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 ...