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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 ...
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]
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 ...
Letter beacon. Signal of letter beacon D on 5137.5 kHz. Letter beacons are radio transmissions of uncertain origin and unknown purpose, consisting of only a single repeating Morse code letter. They have been classified into a number of groups according to transmission code and frequency, and it is supposed that the source for most of them is ...
Amateur radio contests are not run on the WARC bands. 20 metres – 14.000–14.350 MHz – 21.41–20.89 m actual; Considered the most popular DX band; usually most popular during daytime. QRP operators recognize 14.060 MHz as their primary calling frequency within the band. Users of the PSK31 data mode tend to congregate around 14.070 MHz.
List of software-defined radios. This article provides a list of commercially available software-defined radio receivers . Embedded or True IQ data via 1 x USB 3.1 GEN 1. Internet remote via HTTP / JSON. Embedded or True IQ data via 1 x or 2 x USB 3.0. Optional 1 x USB 3.1 GEN2 (power only). Internet remote via HTTP / JSON.
PMR446 (Private Mobile Radio, 446 MHz) is a licence-exempt service in the UHF radio frequency band and is available for business and personal use in most countries throughout the European Union. [1] PMR446 is typically used for small-site, same-building and line of sight outdoor activities. Equipment used ranges from consumer-grade to ...
Everyday the Waldos would meet at 4:20 p.m. under the school’s Louis Pasteur statue to smoke and then, with treasure map in hand, go out to hunt for the plant. ... Some say 420 is police code ...