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  2. Plectron - Wikipedia

    en.wikipedia.org/wiki/Plectron

    This included ambulance crews, full-time and volunteer firefighters, off-duty specialized police response teams, Civil Defense members, and search and rescue teams. A Plectron's main feature (distinguishing it from a regular squelched radio) was its selective de-squelching. It would only sound when a correct pair of tones were broadcast ...

  3. Police radio - Wikipedia

    en.wikipedia.org/wiki/Police_radio

    Police radio is a radio system used by police and other law enforcement agencies to communicate with one another. Police radio systems almost always use two-way radio systems to allow for communications between police officers and dispatchers .

  4. EF Johnson Technologies - Wikipedia

    en.wikipedia.org/wiki/EF_Johnson_Technologies

    E.F. Johnson Museum, Waseca, Minnesota EF Johnson Citizen Band walkie-talkie The company was founded in 1923 by Edgar F. Johnson and his wife Ethel Johnson. The company began as a mail order business, selling radio transmitting parts to amateurs and early radio broadcasters from space shared with a woodworking shop located in downtown Waseca.

  5. Radio scanner - Wikipedia

    en.wikipedia.org/wiki/Radio_scanner

    An Icom IC-R5 hand-held scanner A GMRS radio that also has scanning capabilities. A scanner (also referred to as a radio scanner) is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases.

  6. LA residents turn to apps like Watch Duty and social ... - AOL

    www.aol.com/news/la-residents-turn-apps-watch...

    One user named OnerKram17, has dedicated two days to monitoring police and fire scanners, providing frequent updates in the r/PacificPalisades subreddit in between what they said was a few hours ...

  7. StarCom21 - Wikipedia

    en.wikipedia.org/wiki/StarCom21

    These include radios offered to every police, fire, rescue and EMA agency in the State, hospitals, central dispatch centers, State and other colleges and universities and others. StarCom21 Customer Users (those who pay a fee to use Motorola owned infrastructure) include the Illinois State Police (21 posts) as well as other state agencies and: