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  2. Amateur radio emergency communications - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_emergency...

    Solar-powered Amateur Radio Station in tents. Note the portable VHF/UHF satellite and HF antennas in the background Rugged HF transceiver for voice communications. In times of crisis and natural disasters, amateur radio is often used as a means of emergency communication when wireline, cell phones and other conventional means of communications fail.

  3. International distress frequency - Wikipedia

    en.wikipedia.org/wiki/International_distress...

    GMRS: 462.675 MHz is a UHF mobile distress and road information calling frequency allocated to the General Mobile Radio Service and used throughout Alaska and Canada for emergency communications; sometimes referred to as "Orange Dot" by some transceiver manufacturers who associated a frequency with a color-code for ease of channel coordination ...

  4. National Interoperability Field Operations Guide - Wikipedia

    en.wikipedia.org/wiki/National_Interoperability...

    The frequencies allow them to gather intelligence and monitor emergency services, government agencies, and emergency amateur radio frequencies during and after a disaster. The current version is 2.01 and was issued in March of 2022. [6] It can be ordered online, downloaded as a PDF or loaded into a mobile device.

  5. List of amateur radio frequency bands in India - Wikipedia

    en.wikipedia.org/wiki/List_of_amateur_radio...

    Amateur radio or ham radio is a hobby that is practised by over 16,000 licensed users in India. [1] Licences are granted by the Wireless and Planning and Coordination Wing (WPC), a branch of the Ministry of Communications and Information Technology. In addition, the WPC allocates frequency spectrum in India.

  6. File:United States Frequency Allocations Chart 2016 - The ...

    en.wikipedia.org/wiki/File:United_States...

    The following other wikis use this file: Usage on az.wikipedia.org Tezliyin paylanması; Usage on ca.wikipedia.org Banda ISM; Usage on fa.wikipedia.org

  7. Radio silence - Wikipedia

    en.wikipedia.org/wiki/Radio_silence

    A ham in a remote location may be able to relay emergency information through another wilderness ham who has better access to a repeater. National calling frequencies: 52.525, 146.52, 223.50, 446.00, 1294.50 MHz. Priority transmissions should begin with the LITZ (Long Interval Tone Zero or Long Time Zero) DTMF signal for at least 5 seconds.

  8. Amateur radio frequency allocations - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_frequency...

    Specific frequency allocations vary from country to country and between ITU regions as specified in the current ITU HF frequency allocations for amateur radio. [1] The list of frequency ranges is called a band allocation, which may be set by international agreements, and national regulations. The modes and types of allocations within each ...

  9. Amateur radio - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio

    Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communications. [1]

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