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The Whistler Group was an electronics company based in Bentonville, Arkansas, [1] best known for its radar detectors. Whistler also manufactured power inverters , GPS navigation devices , inspection cameras, LED flashlights , vehicle dashboard cameras , and scanner radios . [ 2 ]
Whistler later began selling radio scanners formerly produced for Radio Shack with separate product numbers but identical hardware. In February, 2014, GRE (Japan) head office closed its Tokyo office and relocated to its Chiba location where they had once produced its product line when it first established back in 1961.
Several hand-held Project 25 radios used around the world. 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]
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 .
An Icom IC-R5 hand-held scanner A GMRS radio that also has scanning capabilities. A scanner (also referred to as a radio scanner) is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases.
E-Comm 9-1-1 is a multi-municipality agency that provides emergency communications for British Columbia.The company coordinates 9-1-1 PSAP answering service for police, fire, and ambulance services in all of the province of BC, excluding the City of Nelson.
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 .
where is the speed of light, is the emitted frequency of the radio waves, and is the difference in frequency between the radio waves that are emitted and those received back by the gun. This equation holds precisely only when object speeds are low compared to that of light, but in everyday situations, this is the case and the velocity of an ...