Near-range personnel beacon locator apparatus
First Claim
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1. A personnel beacon locator apparatus comprising in combination:
- an antenna and tuned tank circuit to receive an RF signal, said RF signal being radiated by an accidently activated survival beacon,a detector unit connected to said tuned tank circuit to detect said RF signal, said detector unit providing a detected RF output signal,a low pass filter unit connected to said detector unit to filter said detected RF output signal, said low pass filter unit providing a filtered output signal,an operational amplifier connected to said low pass filter unit to receive said filtered output signal, said operational amplifier having a variable gain, said operational amplifier amplifying said filtered output signal to provide a DC level, said DC level being proportional to the distance to said activated survival beacon,a timer unit connected to said operational amplifier to receive said DC level, said timer unit having a variable duty cycle, said timer unit providing a pulsed output signal, said pulsed output signal having a variable pulse width, said pulse width varying in response to the level of said DC level, said pulsed output signal driving an LED indicator, said LED indicator blinking at a rate proportional to the diatance to said activated survival beacon, and,a power supply unit connected to said operational amplifier and timer units to supply DC voltages thereto.
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Abstract
A near-range personnel beacon locator apparatus utilizing a tuned tank circuit to receive the emitted signal from an activated personnel beacon. The detected signal is applied to a D.C. amplifier to provide a D.C. level which drives a controlled variable duty cycle timer for driving a light emitting diode indicator.
8 Citations
7 Claims
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1. A personnel beacon locator apparatus comprising in combination:
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an antenna and tuned tank circuit to receive an RF signal, said RF signal being radiated by an accidently activated survival beacon, a detector unit connected to said tuned tank circuit to detect said RF signal, said detector unit providing a detected RF output signal, a low pass filter unit connected to said detector unit to filter said detected RF output signal, said low pass filter unit providing a filtered output signal, an operational amplifier connected to said low pass filter unit to receive said filtered output signal, said operational amplifier having a variable gain, said operational amplifier amplifying said filtered output signal to provide a DC level, said DC level being proportional to the distance to said activated survival beacon, a timer unit connected to said operational amplifier to receive said DC level, said timer unit having a variable duty cycle, said timer unit providing a pulsed output signal, said pulsed output signal having a variable pulse width, said pulse width varying in response to the level of said DC level, said pulsed output signal driving an LED indicator, said LED indicator blinking at a rate proportional to the diatance to said activated survival beacon, and, a power supply unit connected to said operational amplifier and timer units to supply DC voltages thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification