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  2. Vintage amateur radio - Wikipedia

    en.wikipedia.org/wiki/Vintage_amateur_radio

    Glowing cathodes in two transmitting vacuum tubes. Repair and restoration of vintage amateur radio equipment may involve replacing vacuum tubes, reforming electrolytic capacitors if needed, replacing any faulty resistors, replacing two-wire power cords with three-wire cords except on transformerless AC/DC radios, and receiver alignment as ...

  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. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    The "main" system (also known as Front of House, commonly abbreviated FOH), which provides the amplified sound for the audience, typically uses a number of powerful amplifiers that drive a range of large, heavy-duty loudspeakers—including low-frequency speaker cabinets called subwoofers, full-range speaker cabinets, and high-range horns. A ...

  5. Midland Radio - Wikipedia

    en.wikipedia.org/wiki/Midland_Radio

    The two main Emergency Alert products are the ER210 and ER310. Both are equipped with hand cranks and solar for a sustainable, back up power source. Multiple power source options - USB, LED flashlight, Hand Crank and rechargeable batteries. Two -Way Radios. Midland Radio offers four lines of two-way radios: X-Talker, LXT, GXT and XT511; MicroMobile

  6. EF Johnson Technologies - Wikipedia

    en.wikipedia.org/wiki/EF_Johnson_Technologies

    EF Johnson Technologies, Inc. is a two-way radio manufacturer founded by its namesake, Edgar Frederick Johnson, in Waseca, Minnesota, United States in 1923. [1] Today it is a wholly owned subsidiary of JVCKenwood of Yokohama, Japan. EF Johnson Technologies offers a wide range of equipment for use by law enforcement, firefighters, EMS, and military.

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