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  2. Rubber ducky antenna - Wikipedia

    en.wikipedia.org/wiki/Rubber_ducky_antenna

    The rubber ducky antenna (or rubber duck aerial) is an electrically short monopole antenna, invented by Richard B. Johnson, that functions somewhat like a base-loaded whip antenna. It consists of a springy wire in the shape of a narrow helix , sealed in a rubber or plastic jacket to protect the antenna. [ 1 ]

  3. Project 25 - Wikipedia

    en.wikipedia.org/wiki/Project_25

    Several hand-held Project 25 radios used around the world. Project 25 (P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1]

  4. CB radio in the United States - Wikipedia

    en.wikipedia.org/wiki/CB_radio_in_the_United_States

    The antenna may not be more than 20 feet (6.1 m) above the highest point of the structure it is mounted to, or the highest point of the antenna must not be more than 60 feet (18.3 m) above the ground (47 CFR 95.408(c)) if installed in a fixed location. [4] CB radios must include AM or SSB modulation and may include frequency modulation. [5]

  5. Trunked radio system - Wikipedia

    en.wikipedia.org/wiki/Trunked_radio_system

    In essence, a trunked radio system is a packet switching computer network. Users' radios send data packets to a computer, operating on a dedicated frequency — called a control channel — to request communication on a specific talkgroup.

  6. Owensboro police encrypting scanner traffic; could Evansville ...

    www.aol.com/owensboro-police-encrypting-scanner...

    Hamilton County, Indiana blocked the public from hearing scanner traffic last July, while Hendricks County now releases fire and police calls on a 15-minute delay.

  7. Radio repeater - Wikipedia

    en.wikipedia.org/wiki/Radio_repeater

    In a shared system, a receive antenna is usually located at the top of the antenna tower. Putting the receive antenna at the top helps to capture weaker received signals than if the receive antenna were lower of the two. By splitting the received signal from the antenna, many receivers can work satisfactorily from a single antenna.

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