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  2. List of European short wave transmitters - Wikipedia

    en.wikipedia.org/wiki/List_of_European_short...

    Frequency (MHz) Program Transmitter site Time, UTC Days Language Power (kW) Az Remarks 3.965 Radio France Internationale (DRM) Issoudun 01:00-00:57 1234567 French (Digital) 1 ND RFI 3.975 6160 Shortwave AM Radio Winsen 16:00-18:00 .234567 English 1 ND 3.985 SRF Schweizer Radio Kall-Krekel 16:00-17:00 1234567 German 1 ND 3.995 HCJB Deutsch

  3. Amateur radio net - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_net

    An amateur radio net, or simply ham net, is an "on-the-air" gathering of amateur radio operators.Most nets convene on a regular schedule and specific frequency, and are organized for a particular purpose, such as relaying messages, discussing a common topic of interest, in severe weather (for example, during a Skywarn activation), emergencies, or simply as a regular gathering of friends for ...

  4. List of shortwave radio broadcasters - Wikipedia

    en.wikipedia.org/wiki/List_of_shortwave_radio...

    Radio club broadcasts weekly bulletins in English and Afrikaans. Bulletins available online in text format only. Radio Sonder Grense: 1937 2019 No Yes Domestic Afrikaans-language radio service operated by the SABC. Used shortwave to reach remote areas of South Africa.

  5. History of radio - Wikipedia

    en.wikipedia.org/wiki/History_of_radio

    The Radio Act of 1927 gave the Federal Radio Commission the power to grant and deny licenses, and to assign frequencies and power levels for each licensee. In 1928 it began requiring licenses of existing stations and setting controls on who could broadcast from where on what frequency and at what power.

  6. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

  7. NOAA Weather Radio - Wikipedia

    en.wikipedia.org/wiki/NOAA_Weather_Radio

    The U.S. Weather Bureau first began broadcasting marine weather information in Chicago and New York City on two VHF radio stations in 1960 as an experiment. [1] [2] Proving to be successful, the broadcasts expanded to serve the general public in coastal regions in the 1960s and early 1970s. [3]

  8. IEEE 802.11 - Wikipedia

    en.wikipedia.org/wiki/IEEE_802.11

    The segment of the radio frequency spectrum used by 802.11 varies between countries. In the US, 802.11a and 802.11g devices may be operated without a license, as allowed in Part 15 of the FCC Rules and Regulations. Frequencies used by channels one through six of 802.11b and 802.11g fall within the 2.4 GHz amateur radio band.

  9. Citizen science - Wikipedia

    en.wikipedia.org/wiki/Citizen_science

    Examples include amateur radio, amateur astronomy, Six Sigma Projects, and Maker activities. Scientist Joshua Pearce has advocated for the creation of open-source hardware based scientific equipment that both citizen scientists and professional scientists, which can be replicated by digital manufacturing techniques such as 3D printing . [ 151 ]

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