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  2. 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.

  3. Family Radio Service - Wikipedia

    en.wikipedia.org/wiki/Family_Radio_Service

    New rules issued by the FCC in May 2017 clarify and simplify the overlap between FRS and General Mobile Radio Service (GMRS) radio services. [1] Worldwide, a number of similar personal radio services exist; these share the characteristics of low power operation in the UHF (or upper VHF) band using FM, and simplified or no end-user licenses.

  4. Watch strap - Wikipedia

    en.wikipedia.org/wiki/Watch_strap

    A leather watch strap with a butterfly closure Four analog wristwatches for men with variants of the widespread metal watch strap made from stainless steel, the two in the middle being of the most common type. A watch strap, watch band, watch bracelet or watch belt is a bracelet that straps a wrist watch onto the wrist. [1]

  5. Sideband - Wikipedia

    en.wikipedia.org/wiki/Sideband

    The power of an AM radio signal plotted against frequency. fc is the carrier frequency, fm is the maximum modulation frequency. In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, that are the result of the modulation process.

  6. Digital Audio Broadcasting - Wikipedia

    en.wikipedia.org/wiki/DAB+

    Digital multimedia broadcasting (DMB) and DAB-IP are both suitable for mobile radio and TV because they support MPEG 4 AVC and WMV9 respectively as video codecs. However, a DMB video subchannel can easily be added to any DAB transmission, as it was designed to be carried on a DAB subchannel.

  7. 5G NR frequency bands - Wikipedia

    en.wikipedia.org/wiki/5G_NR_frequency_bands

    Frequency bands for 5G New Radio (5G NR), which is the air interface or radio access technology of the 5G mobile networks, are separated into two different frequency ranges. First there is Frequency Range 1 (FR1), [ 1 ] which includes sub-7 GHz frequency bands, some of which are traditionally used by previous standards, but has been extended to ...

  8. D band (waveguide) - Wikipedia

    en.wikipedia.org/wiki/D_band_(waveguide)

    The waveguide D band is the range of radio frequencies from 110 GHz to 170 GHz in the electromagnetic spectrum, [1] [2] corresponding to the recommended frequency band of operation of the WR6 and WR7 waveguides. [3] These frequencies are equivalent to wavelengths between 2.7 mm and 1.8 mm. The D band is in the EHF range of the radio spectrum.

  9. Cellular frequencies - Wikipedia

    en.wikipedia.org/wiki/Cellular_frequencies

    Many GSM phones support three bands (900/1,800/1,900 MHz or 850/1,800/1,900 MHz) or four bands (850/900/1,800/1,900 MHz), and are usually referred to as tri-band and quad-band phones, or world phones; with such a phone one can travel internationally and use the same handset. This portability is not as extensive with IS-95 phones, however, as IS ...

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