Communications: electrical – Selective – Monitoring in addition to control
Patent
1976-02-13
1977-03-22
Farley, Richard A.
Communications: electrical
Selective
Monitoring in addition to control
G01S 970
Patent
active
040139913
ABSTRACT:
An ultrasonic depth indicator having an ultrasonic transducer suitable for mounting on a boat, transmitter, receiver and rotating indicator, with transmitted echoes producing receiver output pulses for energizing the indicator, with the angular distance between indicator pulses providing a measure of depth of the item producing the echo. A synchronization signal source for operating the transmitter in synchronism with indicator rotation. A logic circuit, typically a bistable flip-flop, having the transmitter trigger signal as an input and producing an inhibit signal as an output for inhibiting transmitter and receiver operation during predetermined revolutions of the indicator.
REFERENCES:
patent: 3267413 (1966-08-01), Beebe et al.
Cetec Corporation
Farley Richard A.
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