Abstract: Apparatus for detecting the presence of a speed detection system includes a microcontroller, a laser detector circuit coupled to the microcontroller, a radar detector circuit coupled to the microcontroller and a display coupled to the microcontroller, wherein the microcontroller receives signals from the laser detector and radar detector circuits and in response to the signals fed thereto, the microcontroller provides an output signal indicating which of the laser and radar detector circuits fed a signal thereto.

Abstract: A secondary thermal overload device is connected to one winding of a motor having a bi-directional rotatable output shaft and is preset at a lower trip temperature than a trip temperature of a primary thermal overload device connected to the motor to deactivate only the one motor winding effecting closing movement of a garage door at a lower motor operating temperature and before the primary thermal overload device trips while enabling the motor winding associated with an opening movement of the garage door to be activated to open the garage door.

Abstract: A vehicle security system including a remote control communicating with the system via an RF link for remotely arming and/or disarming the system. Modes of system operation include an armed mode in which sensor outputs are monitored for intrusion indicating conditions and an RF receiver is monitored for remote commands, an alarm mode in which a siren is sounded in response to a detection of an intrusion indicating condition during the armed mode, a disarmed mode in which sensor monitoring for intrusion conditions is disabled, a programming mode in which features of the system are programmable, a valet mode in which only selected sensor outputs are monitored, and a pre-arming mode following system disarming and prior to passive arming, in which the door switch is monitored. A display facilitates programming by providing an indication of the present position within the programming sequence.

Abstract: A radio-frequency detection apparatus including a signal input for providing an input signal and a phase shifter having a first connection and a second connection. The phase shifter includes a SAW device having a first electrical connection and a second electrical connection, wherein the SAW first electrical connection is coupled to the phase shifter first connection and the SAW second electrical connection is coupled to the phase shifter second connection. The radio-frequency detection apparatus also includes a multiplier having a multiplier first input connection, a multiplier second input connection and at least one multiplier output connection, the multiplier first input connection being coupled to the signal input and the phase shifter first connection and the multiplier second input connection being coupled to the phase shifter second connection. The phase shifter introduces approximately a 90 degree phase shift into the input signal at approximately the frequency of minimum insertion loss.

Abstract: A radar detector including a local oscillator capable of sweeping over a frequency range of sufficient bandwidth to provide a fundamental frequency and, when injected into a multiplier/mixer, harmonics of that fundamental frequency suitable for heterodyning with rf-signals received by an antenna. The heterodyning of the received rf-signals and the local oscillator signal produce an intermediate frequency signal of constant frequency. A sweep controller causes the local oscillator to sweep only through those local oscillator frequencies suitable for heterodyning with those received rf-signals having radio-frequencies which are of interest. The sweep controller causes the sweeping local oscillator not to sweep through those local oscillator frequencies which would heterodyne with received rf-signals that are not of interest.

Abstract: A top mounted buoy signaling device for marine navigation which is selectively activated in response to a coded address signal. The buoy signaling device includes a buoy having a top mounted receiver assembly which is activated by a transmitter assembly. The receiver circuit, transmitter circuit and antennas therefor are printed on circuit boards. The transmitter circuit includes an encoder chip which is preset to provide a coded address. The coded address is utilized to modulate a carrier signal to provide a coded address signal to activate the receiver circuit. The receiver circuit includes a decoder chip which is preset to the coded address of the corresponding transmitter. A lamp driver subcircuit is enabled in response to the coded address signal. The lamp driver subcircuit includes a master timer subcircuit which maintains the driver subcircuit in an operative condition for a predetermined period of time and a flash timer subcircuit which periodically energizes a lamp to provide a flashed output.

Abstract: A marine transponder system which is selectively activated to produce a predetermined signal pattern of light/sound/radio transmissions for maritime devices and structures such as navigational aids, mooring, docking or slip facilities and/or EPIRBs and other emergency signalling devices. A remote transmitter is used to broadcast an uncoded or coded signal at a predetermined frequency to activate the marine transponder system. The transponder system includes an RF receiver tuned to the predetermined frequency, and optionally a decoder unit for verifying the coded signal. Upon receipt of the transmitted frequency signal, the transponder system causes an omni-directional light/sound/radio source to be energized to produce the predetermined signal pattern. The marine transponder system may be an add-on adapted for integration with existing navigational buoys, a standalone buoy, a package configured for mounting on a dock, pier or boat, or a package adapted to be mounted on a life vest/preserver.