Communications: directive radio wave systems and devices (e.g. – Radar ew – Detection of surveilance
Patent
1987-07-28
1989-12-12
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Radar ew
Detection of surveilance
455168, 455227, 340902, 340904, G01S 740
Patent
active
048870862
ABSTRACT:
A radio receiver for use in a vehicle combines a radar receiver, a receiver for the citizen band, and a scanning receiver for public service bands which are controlled in operation and function by a microprocessor. The public service scanning receiver covers a range of public service bands from 37 MHz to 470 MHz. The receiver for the citizen band covers frequencies from 26 to 28 MHz. The radar receiver covers frequencies of traffic radars located in the X and K bands, from 8 to 24 GHz. In the preferred embodiment, a radar detector responds to radar signals in either the X or K band under control of the microprocessor, and is in a standby mode whether or not the operator is listening to reception on the citizen band or a public service band. A synthesizer either selects a desired channel in the citizen band or else scans a preselected group of public service frequencies that correspond to those assigned to a particular state, country or city. Combined radio front ends are served by the synthesizer that is controlled by the microprocessor. Received signals undergo a dual conversion to produce an IF signal that is either narrow-band FM in the case of public service signals or AM in the case of CB. The signal that is selected is controlled by the microprocessor and is coupled to an audio amplifier and speaker to be heard. Under the control of a microprocessor, a detected traffic radar signal will override the signal being heard unless the operator elects otherwise. The use of a common front end for the public service receiver and the citizen band receiver minimizes cost and simplifies control of bands and frequencies by the microprocessor, leading to a portable device that is readily removed from a vehicle to minimize the risk of theft.
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Crum Stephen T.
Unser Bobby
Sotomayor John B.
Tarcza Thomas H.
Trycomm Technologies, Inc.
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