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  2. 1-millimeter band - Wikipedia

    en.wikipedia.org/wiki/1-millimeter_band

    The current world distance record on the 1 mm band was 114 kilometres (71 mi) set by US stations WA1ZMS and W4WWQ on January 21, 2008. [4] [5]The longest distance achieved on 1 mm in the United Kingdom was 9.33 kilometres (5.80 mi) between stations G0FDZ and G8CUB on April 30 2019.

  3. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    1 Band 1: 100 Mm 3 Hz 12.4 feV ... Scale; Wavelength pm ... making this frequency range useless for long-distance communication.

  4. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    1.010 Mmdistance from San Diego to El Paso as the crow flies; 1.100 Mm – length of Italy; 1.200 Mm – length of California; 1.200 Mm – width of Texas; 1.500 Mm – length of the Gobi Desert; 1.600 Mm – length of the Namib, the oldest desert on Earth; 2.000 Mmdistance from Beijing to Hong Kong as the crow flies

  5. Radio spectrum - Wikipedia

    en.wikipedia.org/wiki/Radio_spectrum

    A radio band is a small frequency band (a contiguous section of the range of the radio spectrum) in which channels are usually used or set aside for the same purpose. To prevent interference and allow for efficient use of the radio spectrum, similar services are allocated in bands.

  6. Extremely high frequency - Wikipedia

    en.wikipedia.org/wiki/Extremely_high_frequency

    Extremely high frequency (EHF) is the International Telecommunication Union designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz (GHz). [1] [2] It is in the microwave part of the radio spectrum, between the super high frequency band and the terahertz band.

  7. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  8. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    A common adjustment value in firearm sights is 1 cm at 100 meters which equals ⁠ 10 mm / 100 m ⁠ = ⁠ 1 / 10 ⁠ mrad. The true definition of a milliradian is based on a unit circle with a radius of one and an arc divided into 1,000 mrad per radian, hence 2,000 π or approximately 6,283.185 milliradians in one turn , and rifle scope ...

  9. List of metric units - Wikipedia

    en.wikipedia.org/wiki/List_of_metric_units

    The fermi is a unit of distance used in nuclear physics equal to 1 fm. [9] The angstrom (symbol Å) is a unit of distance used in chemistry and atomic physics equal to 100 pm. The micron (μ) is a unit of distance equal to one micrometre (1 μm). The basic module (M) is a unit of distance equal to one hundred millimetres (100 mm).