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  2. CB radio in the United States - Wikipedia

    en.wikipedia.org/wiki/CB_radio_in_the_United_States

    Adjacent frequencies are often used by illegal operators using modified CB or amateur radio equipment. Operators sometimes refer to this activity as freebanding. The Industrial/Business Radio Pool of the Private Land Mobile Radio Services has several channels just above the Citizen's Band, at 27.430, 27.450, 27.470, 27.490, 27.510, and 27.530 MHz.

  3. Single-sideband modulation - Wikipedia

    en.wikipedia.org/wiki/Single-sideband_modulation

    In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently.

  4. Citizens band radio - Wikipedia

    en.wikipedia.org/wiki/Citizens_band_radio

    Citizens band radio (CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band.

  5. Radiotelephone - Wikipedia

    en.wikipedia.org/wiki/Radiotelephone

    Single-sideband (SSB) is used because the short wave bands are crowded with many users, and SSB permits a single voice channel to use a narrower range of radio frequencies (bandwidth) when compared to earlier AM systems. [5] SSB uses about 3.5 kHz, while AM radio uses about 8 kHz, and narrowband (voice or communication-quality) FM uses 9 kHz.

  6. 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. The sidebands carry the information transmitted by the radio ...

  7. Types of radio emissions - Wikipedia

    en.wikipedia.org/wiki/Types_of_radio_emissions

    Double-sideband amplitude modulation (e.g. AM broadcast radio) B: Independent sideband (two sidebands containing different signals) C: Vestigial sideband (e.g. NTSC) D: Combination of AM and FM or PM F: Frequency modulation (e.g. FM broadcast radio) G: Phase modulation: H: Single-sideband modulation with full carrier (e.g. as used by CHU) J

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