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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. ... call boxes, police boxes, or physical meetings.

3. 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.

4. Police code - Wikipedia

   en.wikipedia.org/wiki/Police_code

   A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include "10 codes" (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes, or other status ...

5. Emergency service response codes - Wikipedia

   en.wikipedia.org/wiki/Emergency_service_response...

   The use of lights and sirens is up to the individual police officer driving to the call. The nature of the call is an aggravating factor when deciding when to use them. Calls are graded by either the control room direct (in the case of emergency calls) or by some sort of first contact centre (nonemergency calls).

6. Home Office radio - Wikipedia

   en.wikipedia.org/wiki/Home_Office_radio

   By the 1970s most police and fire services had their own dedicated radio setups, and personal radios (referred to as PRs) were beginning to be rolled out to the police in most towns and cities. Home Office radio was furthered towards the end of the Cold War, with having a communications network that was independent of the then Post Office ...

7. 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 ...

8. Secret Service and local cops weren’t listening to same radio ...

   www.aol.com/news/secret-local-cops-were...

   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 ...

9. End of Watch Call - Wikipedia

   en.wikipedia.org/wiki/End_of_Watch_Call

   The End of Watch Call or Last Radio Call is a ceremony in which, after a police officer's death (usually in the line of duty but sometimes from illness), the officers from his or her unit or department gather around a police radio, over which the police dispatcher issues one call to the officer, followed by a silence, then a second call, followed by silence.