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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 ...
United States. [] 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.
The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...
121.5 MHz is the civilian aircraft emergency frequency or International Air Distress frequency. It is used by some civilian emergency locator beacons; however, the Cospas-Sarsat system no longer monitors the frequency. 243 MHz for NATO military aircraft emergency frequencies. 406 MHz to 406.1 MHz is used by the Cospas-Sarsat international ...
The system makes use of 0, 75, 120, 180 and 270 ppm codes using a 50 Hz current. Continuous Automatic Warning System is the cab signaling systems in Ireland. The system makes use of 0, 50, 120 and 180 ppm codes using a 50 Hz carrier current. Additional codes are used on some rapid transit lines.
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]
Code 10: Request to clear frequency for broadcast of wanted/warrant information; Code 12: Request to clear frequency for request for information on potential individual arrest warrant; Code 20: Notify media (or media already on scene) Code 30: Burglar alarm (can be Code 30-Silent) Code 30-Adam: Burglar alarm, location is monitored with audio by ...
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