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  2. Pirate radio in North America - Wikipedia

    en.wikipedia.org/wiki/Pirate_radio_in_North_America

    The strict definition of a pirate radio station is a station that operates from sovereign territory without a broadcasting license, or just beyond the territorial waters of a sovereign nation from on board a ship or other marine structure with the intention of broadcasting to that nation without obtaining a broadcasting license from that nation (such as Radio Caroline before its present ...

  3. Morse code abbreviations - Wikipedia

    en.wikipedia.org/wiki/Morse_code_abbreviations

    Morse code abbreviations are not the same as prosigns.Morse abbreviations are composed of (normal) textual alpha-numeric character symbols with normal Morse code inter-character spacing; the character symbols in abbreviations, unlike the delineated character groups representing Morse code prosigns, are not "run together" or concatenated in the way most prosigns are formed.

  4. High frequency - Wikipedia

    en.wikipedia.org/wiki/High_frequency

    HF's position in the electromagnetic spectrum.. High frequency (HF) is the ITU designation [1] [2] for the band of radio waves with frequency 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 decameters (ten to one hundred meters).

  5. Multiservice tactical brevity code - Wikipedia

    en.wikipedia.org/wiki/Multiservice_tactical...

    An aircraft identified as enemy, in accordance with theater ID criteria. The term does not necessarily imply direction or authority to engage. Banzai Information/directive to execute launch and decide tactics. Base (number) Reference number used to indicate such information as headings, altitude, and fuels. Bassett Rocket-thrown ASW torpedo ...

  6. Glossary of early twentieth century slang in the United States

    en.wikipedia.org/wiki/Glossary_of_early...

    Notes Works cited References External links 0-9 S.S. Kresge Lunch Counter and Soda Fountain, about 1920 86 Main article: 86 1. Soda-counter term meaning an item was no longer available 2. "Eighty-six" means to discard, eliminate, or deny service A A-1 First class abe's cabe 1. Five dollar bill 2. See fin, a fiver, half a sawbuck absent treatment Engaging in dance with a cautious partner ab-so ...

  7. HF - Wikipedia

    en.wikipedia.org/wiki/HF

    Hafnium, symbol Hf, a chemical element; Hartree–Fock method, a calculation scheme in the field of computational chemistry; Hydrogen fluoride, HF, a diatomic compound which can dissolve in water to form hydrofluoric acid, a highly corrosive solution; Hydrofluoric acid, HF (aq), a solution of hydrogen fluoride (HF) in water

  8. Automatic link establishment - Wikipedia

    en.wikipedia.org/wiki/Automatic_Link_Establishment

    Automatic Link Establishment, commonly known as ALE, is the worldwide de facto standard for digitally initiating and sustaining HF radio communications. [1] ALE is a feature in an HF communications radio transceiver system that enables the radio station to make contact, or initiate a circuit, between itself and another HF radio station or network of stations.

  9. Etymology of ham radio - Wikipedia

    en.wikipedia.org/wiki/Etymology_of_ham_radio

    Ham radio is a popular term for amateur radio, derived from "ham" as an informal name for an amateur radio operator.The use first appeared in the United States during the opening decade of the 20th century—for example, in 1909, Robert A. Morton reported overhearing an amateur radio transmission which included the comment: "Say, do you know the fellow who is putting up a new station out your way?