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  2. Amateur radio operator - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_operator

    When referring to a person, the phrase Silent Key, and its abbreviation SK, is a euphemism for an amateur radio operator who is deceased. [34] The procedural signal " SK" (or "VA") has historically been used in Morse code as the last signal sent from a station before ending operation, [35] usually just before shutting off the transmitter. Since ...

  3. Amateur radio - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio

    A reciprocal licensing agreement between two countries allows bearers of an amateur radio license in one country under certain conditions to legally operate an amateur radio station in the other country without having to obtain an amateur radio license from the country being visited, or the bearer of a valid license in one country can receive a ...

  4. 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?

  5. List of nicknames for McDonald's - Wikipedia

    en.wikipedia.org/wiki/List_of_nicknames_for...

    The slang nickname is similar to the family name of Clan McDuck. It was proposed as the new name for McDonalds after the chain decided to abandon its operations in Russia. [20] Zur goldenen Möwe Germany See danish nickname [21] Maccern Norway Common nickname with multiple spellings.

  6. High frequency - Wikipedia

    en.wikipedia.org/wiki/High_frequency

    High frequency (HF) is the ITU designation [1] 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).

  7. List of acronyms: H - Wikipedia

    en.wikipedia.org/wiki/List_of_acronyms:_H

    initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee; pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).

  8. Amateur radio call signs - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_call_signs

    A geographical portion of one country can be a separate DXCC entity if it is an exclave or an island or group of islands significantly distant from the main part of the national entity. IOTA is a radio amateur abbreviation for "Islands on the Air".

  9. 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