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  2. Citizens band radio - Wikipedia

    en.wikipedia.org/wiki/Citizens_band_radio

    Cobra 50 WX ST Handheld CB 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. Citizens band is distinct from other ...

  3. Microphone connector - Wikipedia

    en.wikipedia.org/wiki/Microphone_connector

    SwitchCraft 2501F/2501M. This is the part number for a Swichcraft connector used with high impedance microphones up through about 1980. It was intended for coax style cable up to 0.281 inches (7.1 mm) outside diameter. Attachment is made with a 5/8-27 threaded ring that can be unthreaded over the body of the connector body allowing the female ...

  4. Carbon microphone - Wikipedia

    en.wikipedia.org/wiki/Carbon_microphone

    The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a type of microphone, a transducer that converts sound to an electrical audio signal. It consists of two metal plates separated by granules of carbon. One plate is very thin and faces toward the speaking person, acting as a diaphragm.

  5. Reference designator - Wikipedia

    en.wikipedia.org/wiki/Reference_designator

    A reference designator unambiguously identifies the location of a component within an electrical schematic or on a printed circuit board. The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15. The number is sometimes followed by a letter, indicating that components are grouped or matched with ...

  6. Boundary microphone - Wikipedia

    en.wikipedia.org/wiki/Boundary_microphone

    A boundary microphone (or pressure zone microphone) is one or more small omnidirectional or cardioid condenser mic capsule (s) positioned near or flush with a boundary (surface) such as a floor, table, or wall. The capsule (s) are typically mounted in a flat plate or housing. The arrangement provides a directional half-space pickup pattern ...

  7. Electret microphone - Wikipedia

    en.wikipedia.org/wiki/Electret_microphone

    An electret microphone is a microphone whose diaphragm forms a capacitor (historically-termed a condenser) that incorporates an electret. The electret's permanent electric dipole provides a constant charge Q on the capacitor. Sound waves move the diaphragm, changing the capacitance C, which produces a corresponding voltage change across the ...

  8. List of microphone manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_microphone...

    The following is a list of defunct microphone manufacturers with articles. Aiwa; Altec Lansing; American Microphone; Ampex; Astatic; Brush Development Company; Dynaco ...

  9. CB radio in the United States - Wikipedia

    en.wikipedia.org/wiki/CB_radio_in_the_United_States

    In the United States, the Citizens Band Radio Service (CBRS), commonly called citizens band radio (CB radio), is one of several personal radio services defined under Title 47 of the Code of Federal Regulations, Part 95. [1] It is intended to be a two-way voice communication service for use in personal and business activities of the general ...