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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 ...
This type started in the mid-1970s. Used on town/city government vehicles, including police cars and dump trucks. The letters in the serial indicate the municipality. Municipal – Preserve the Sound Uses a "MUNICIPAL CT" sticker in place of validation sticker. 1·AB 12·AB 123·AB 1·ABC 12·ABC 123·ABC: Letters signify municipality. New York ...
[[Category:Connecticut radio market navigational boxes]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Connecticut radio market navigational boxes]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
Traffic Message Channel (TMC) is a technology for delivering traffic and travel information to motor vehicle drivers.It is digitally coded using the ALERT C or TPEG protocol into Radio Data System (RDS) [1] carried via conventional FM radio broadcasts.
The development of the APCO Ten Signals began in 1937 [5] to reduce use of speech on the radio at a time when police radio channels were limited. Credit for inventing the codes goes to Charles "Charlie" Hopper, communications director for the Illinois State Police , District 10 in Pesotum, Illinois .
LTR MultiNet Systems are APCO-16 compliant LTR Trunked Radio Systems and thus are mostly found in use as public safety systems. LTR MultiNet systems usually have one or more "status channels" that act like a control channel in a Motorola or EDACS system, however these channels can also carry voice transmissions simultaneously.
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The first police radio systems were implemented in Detroit in 1928, when the Detroit Police Department set up a one-way radio system to broadcast crime information to police cars. [2] The frequency was assigned the call sign "KOP" by the Federal Communications Commission .