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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 ...
In the United States, response codes are used to describe a mode of response for an emergency unit responding to a call. They generally vary but often have three basic tiers: Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with emergency lights, but without sirens. Alternatively, sirens may be used if necessary ...
Ten-code. Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code. [1]
Call signs in the United States. Call signs in the United States are identifiers assigned to radio and television stations, which are issued by the Federal Communications Commission (FCC) and, in the case of most government stations, the National Telecommunications and Information Administration (NTIA). They consist of from 3 to 9 letters and ...
Emergency Broadcast System, Local Access Alert. The Emergency Alert System ( EAS) is a national warning system in the United States designed to allow authorized officials to broadcast emergency alerts and warning messages to the public via cable, satellite and broadcast television and AM, FM and satellite radio.
These 67 different three-letter call signs are currently grouped as follows: 25 assigned only to an AM station. 8 assigned only to an FM station. 6 assigned only to a TV station. 13 assigned to both an AM and an FM station. 8 assigned to both an AM and a TV station. 7 assigned to an AM, FM, and TV station.
Pirate television. A pirate television station is a broadcast television station that operates without a broadcast license. Like its counterpart pirate radio, the term pirate TV lacks a specific universal interpretation. It implies a form of broadcasting that is unwelcome by the licensing authorities within the territory where its signals are ...
The first detector was introduced in 1952. It operated by detecting the magnetic field, rather than any radio signal, of the horizontal line-scanning deflectionwithin the cathode ray tube. Television tubes, unlike oscilloscopes, used magnetic deflection. The deflection current was a sawtoothwith a frequency of 10.125 kHz.