Communications: directive radio wave systems and devices (e.g. – Radar ew – Detection of surveilance
Patent
1987-01-30
1989-06-20
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Radar ew
Detection of surveilance
34082536, 340901, 340905, 455 49, 455161, 455345, H04B 1700
Patent
active
048413020
ABSTRACT:
Detection apparatus for alerting an operator of a moving vehicle to the proximity of a radio transmitter of known frequency and power, typically in a police vehicle. The detection apparatus includes a scanner radio having a selected channel set to the know frequency so that it provides a channel active signal during the time that the police vehicle transmitter is on. The detection apparatus further includes a timing circuit for generating a delay interval representative of the maximum time for the moving vehicle to pass the police vehicle and circuitry for generating a visual and/or audible operator alarm during the channel active signal and during the delay interval. The scanner radio is also utilized to monitor voice transmissions between the dispatcher and the police vehicle, thereby providing the vehicle operator with additional information regarding nearby police vehicles. In an alternative embodiment, a single frequency radio receiver is utilized to provide a visual and/or audible operator alarm and can also be utilized to monitor voice transmissions on the known polic vehicle frequency.
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"PAC.RT Portable/Mobile Vehicular Repeater System", Motorola brochure, date unknown.
Blum Theodore M.
Gray Electronics, Inc.
Gregory Bernarr Earl
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