Communications: directive radio wave systems and devices (e.g. – Radar ew – Detection of surveilance
Patent
1989-10-04
1991-04-23
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar ew
Detection of surveilance
342 13, 342195, G01S 1304
Patent
active
050103415
ABSTRACT:
A ten db coupler receives an RF input signal and transmits an attenuated signal through a wideband
arrow band select switch to an RF amplifier. The signal is next processed through an RF amplitude detector. A comparator then receives the signal and generates a pulse in response to signals exceeding a predetermined threshold. A pulse stretcher then eliminates excessive pulses due to noise or other signal oscillations that exceeded the comparator's threshold. A circuit comprising a retriggerable monostable and an OR gate determine if the pulses received exceed a pulse repetition frequency threshold. A ripple counter than eliminates unwanted signals by resetting if a predetermined number is not reached in a specified time. A unique audio signal is then generated if the desired signal is detected. The output signal is audible even though the input signal is of a frequency above the normal hearing threshold. Also a visual signal is provided by a light emitting diode.
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Huntley William P.
Swanick David J.
Lall Prithvi C.
McGowan Michael J.
Sotomayor John B.
The United States of America as represented by the Secretary of
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