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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. Most modern police radio systems are encrypted, and many jurisdictions have made listening to police ...

3. Project 25 - Wikipedia

   en.wikipedia.org/wiki/Project_25

   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] P25 radios are a direct replacement for analog UHF (typically FM ...

4. Radio spectrum - Wikipedia

   en.wikipedia.org/wiki/Radio_spectrum

   The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio ...

5. Police code - Wikipedia

   en.wikipedia.org/wiki/Police_code

   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 ...

6. Los Angeles Police Department resources - Wikipedia

   en.wikipedia.org/wiki/Los_Angeles_Police...

   It was not until Police Chief Roy E. Steckel, however, that the department was assigned its first Federal Communications Commission license. On May 1, 1931, KGPL, the LAPD's dedicated radio callsign, began broadcasting at 1712 kHz, just above the commercial radio broadcasting frequencies; this was later changed to 1730 kHz.

7. AM expanded band - Wikipedia

   en.wikipedia.org/wiki/AM_expanded_band

   Beginning in the 1930s adjacent higher frequencies had commonly been designated as a police radio band. Even after police radio transmissions were no longer made on this band, some county and city ordinances still forbade receivers capable of picking up transmissions on these frequencies, [9] and they had reportedly been occasionally enforced ...

8. Two-way radio frequencies - Wikipedia

   en.wikipedia.org/wiki/Two-way_radio

   This requires either two separate radio channels or channel sharing methods such as time-division duplex (TDD) to carry the two directions of the conversation simultaneously on a single radio frequency. [2] The first two-way radio was an AM-only device introduced by the Galvin Manufacturing Corporation in 1940 for use by the police and military ...

9. Radiotelephony procedure - Wikipedia

   en.wikipedia.org/wiki/Radiotelephony_procedure

   Radiotelephony procedure (also on-air protocol and voice procedure) includes various techniques used to clarify, simplify and standardize spoken communications over two-way radios, in use by the armed forces, in civil aviation, police and fire dispatching systems, citizens' band radio (CB), and amateur radio. Voice procedure communications are ...