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  2. Setcom Corporation - Wikipedia

    en.wikipedia.org/wiki/Setcom_Corporation

    Setcom began making portable radio headsets for firefighters in the 1970s just as it had created the police motorcycle communications kit. Though they started making the headsets early on, they didn't fully step onto the fire communications scene until the late 1980s and early 1990s when they introduced their first intercom system built for ...

  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. 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]

  5. Oakland County announces $61M radio system upgrade for first ...

    www.aol.com/oakland-county-announces-61m-radio...

    Oakland County announced a new first responder radio system Wednesday, improving communication between and across agencies. Skip to main content. Sign in. Mail. 24/7 Help. For premium support ...

  6. The Secret Service and local police were in different command posts at a Trump rally in Pennsylvania and didn't have access to the same radio traffic when word of a gunman came in, the federal ...

  7. Continuous Tone-Coded Squelch System - Wikipedia

    en.wikipedia.org/wiki/Continuous_Tone-Coded...

    The NATO Military radios use 150.0 Hz, and this can be found in the user manuals for the radios. Some areas do not use certain tones. For example, the tone of 100.0 Hz is avoided in the United Kingdom since this is twice the UK mains power line frequency; an inadequately smoothed power supply may cause unwanted squelch opening (this is true in ...