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2. 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 .

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. Ten-code - Wikipedia

   en.wikipedia.org/wiki/Ten-code

   Radios in the 1930s were based on vacuum tubes powered by a small motor-generator called a dynamotor. The dynamotor took from 1/10 to 1/4 of a second to "spin up" to full power. Police officers were trained to push the microphone button, then pause briefly before speaking; however, sometimes they would forget to wait.

5. NYPD encryption of police radios that prevent media from ...

   www.aol.com/lifestyle/nypd-encryption-police...

   The NYPD’s plan to encrypt police radios, which prevents the media and those without the proper codes from tuning in, has begun with six precincts covering Brooklyn disappearing from traditional ...

6. Look Back: Radios installed in Harveys Lake police cruisers ...

   www.aol.com/news/look-back-radios-installed...

   Apr. 7—Police in Harveys Lake were a step ahead from other smaller police departments in the area in 1955. In today's world of instant contact, we look back and scoff. "A two-way radio system of ...

7. Astro (Motorola) - Wikipedia

   en.wikipedia.org/wiki/Astro_(Motorola)

   The ASTRO 25 core is the hub for the communications network. It comprises P25 portable and mobile radios, dispatch consoles, data applications, and RF conventional or trunked sites. [16] In addition to ASTRO 25, Motorola also builds several other P25 radio models, including the APX family of radios, designed for first responders. [17]