Battery powered police radar warning receiver
First Claim
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1. A police radar warning receiver comprising:
- a housing containing operating circuitry and a compartment for holding a battery within the housing for powering the operating circuitry, the operating circuitry including;
energizable RF front end circuit means for interrogating at least one police radar band and outputting low frequency signals in response to signals in the band;
switch means having first and second states for coupling said RF front end circuit means to the battery in said first state and de-coupling same in said second state whereby to selectively energize and de-energize said RF front end circuit means; and
duty cycle means for causing said switch means to be in said first state not more often than once every about one-half second and after a period of time to switch to said second state, said period of time defining a duty cycle rate not greater than about 25%.
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Abstract
In a police radar warning receiver with a self-contained battery source of supply, battery life may be prolonged by duty cycling the RF front end circuitry of the receiver and, especially, the swept oscillator thereof at a duty cycle rate not greater than 25% with the circuitry being energized not more than once every approximately one-half second.
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Citations
23 Claims
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1. A police radar warning receiver comprising:
a housing containing operating circuitry and a compartment for holding a battery within the housing for powering the operating circuitry, the operating circuitry including; energizable RF front end circuit means for interrogating at least one police radar band and outputting low frequency signals in response to signals in the band; switch means having first and second states for coupling said RF front end circuit means to the battery in said first state and de-coupling same in said second state whereby to selectively energize and de-energize said RF front end circuit means; and duty cycle means for causing said switch means to be in said first state not more often than once every about one-half second and after a period of time to switch to said second state, said period of time defining a duty cycle rate not greater than about 25%. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A police radar warning receiver comprising:
a housing containing operating circuitry and a compartment for holding the battery within the housing for powering the operating circuitry, the operating circuitry including; oscillator means for generating an oscillator signal which is swept in frequency between a first frequency and a second frequency associated with at least one police radar band; mixer means for mixing the oscillator signal with received signals to provide IF signals; circuit means responsive to the IF signals for detecting that a police radar-type signal has been received during a given sweep of the oscillator means; switch means having first and second states for coupling at least said oscillator means to the battery in said first state and de-coupling same in said second state whereby to selectively energize and de-energize at least said oscillator means; and duty cycle means for causing said switch means to be in said first state not more often than once about every one-half second and after a period of time to switch to said second state, said period of time defining a duty cycle rate not greater than about 25%. - View Dependent Claims (8)
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9. A police radar warning receiver comprising:
a housing containing operating circuitry and a compartment for holding a battery within the housing for powering the operating circuitry, the operating circuitry including; oscillator means for generating an oscillator signal which is swept in frequency between a first frequency and a second frequency whereby to interrogate at least one police radar band; mixer means for mixing the oscillator signal with received signals in the band to produce IF signals related thereto; FM receiver means responsive to the IF signals for outputting low frequency signals in response to signals in the band; switch means having first and second states for coupling at least said oscillator means to the battery in said first state and de-coupling same in said second state whereby to selectively energize and de-energize at least said oscillator means; duty cycle means for causing said switch means to be in said first state not more often than once about ever one-half second and after a period of time to switch to said second state, said period of time defining a duty cycle rate not greater than about 25%; and control means for causing said oscillator means to make one sweep between said first and second frequencies during said period of time. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of operating a police radar warning receiver powered by a self-contained battery comprising:
operating in a duty-cycle mode including repeatedly; energizing the RF front end circuitry of the receiver every about one-half second and for a period of time substantially less than one-half second; interrogating at least one police radar band while the RF front end circuitry is energized; and de-energizing the RF front end circuitry after the period of time; and operating in a full-on mode if a police radar-type signal is detected during an interrogation including; energizing the RF front end circuitry; and repeatedly interrogating a police radar band. - View Dependent Claims (19, 20)
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21. A method of operating a police radar warning receiver powered by a self-contained battery comprising:
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operating in a duty-cycle mode including repeatedly; energizing a swept oscillator circuit every about one-half second and for a period of time substantially less than one-half second; while the swept oscillator circuit is energized, generating an oscillator signal which is swept in frequency between a first frequency and a second frequency whereby to interrogate at least one police radar band; mixing the oscillator signal with received signals in the band to produce IF signals related thereto; responsive to the IF signals, outputting low frequency signals in response to signals in the band; and de-energizing the swept oscillator circuit; and operating in a full-on mode if a police radar-type signal is detected during an interrogation including; energizing the swept oscillator circuit; and repeatedly generating the oscillator signal. - View Dependent Claims (22, 23)
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Specification