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  2. Counterpoise (ground system) - Wikipedia

    en.wikipedia.org/wiki/Counterpoise_(ground_system)

    Counterpoises are typically used in antenna systems for radio transmitters where a good earth ground connection cannot be constructed.. Monopole antennas used at low frequencies, below 3 MHz, such as the mast radiator antennas used for AM broadcasting, require the radio transmitter to be electrically connected to the Earth under the antenna; this is called a ground (or earth).

  3. Two-way radio - Wikipedia

    en.wikipedia.org/wiki/Two-way_radio

    Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...

  4. Glossary of broadcasting terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_broadcasting_terms

    helical antenna A radio antenna with one or more conductive wires, wound up in the shape of a helix. A version of this is utilized for both FM and UHF broadcasting, while an axial mode helical antenna is commonly used for satellite communication. Also known as the "rubber ducky antenna" used in two way radio. HEVC

  5. RF connector - Wikipedia

    en.wikipedia.org/wiki/RF_connector

    An RF connector (radio frequency connector) is an electrical connector designed to work at radio frequencies in the multi-megahertz range. RF connectors are typically used with coaxial cables and are designed to maintain the shielding that the coaxial design offers.

  6. Antenna feed - Wikipedia

    en.wikipedia.org/wiki/Antenna_feed

    The antenna feed system or antenna feed is the cable or conductor, and other associated equipment, which connects the transmitter or receiver with the antenna and makes the two devices compatible. [ 1 ] [ 2 ] In a radio transmitter, the transmitter generates an alternating current of radio frequency , and the feed system feeds the current to ...

  7. Duplexer - Wikipedia

    en.wikipedia.org/wiki/Duplexer

    In radar and radio communications systems, it isolates the receiver from the transmitter while permitting them to share a common antenna. Most radio repeater systems include a duplexer. Duplexers can be based on frequency (often a waveguide filter ), polarization (such as an orthomode transducer ), or timing (as is typical in radar).

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  9. Repeater - Wikipedia

    en.wikipedia.org/wiki/Repeater

    [2] A radio repeater usually consists of a radio receiver connected to a radio transmitter. The received signal is amplified and retransmitted, often on another frequency, to provide coverage beyond the obstruction. Usage of a duplexer can allow the repeater to use one antenna for both receive and transmit at the same time.