Abstract: A radar detecting system comprises an antenna for receiving radar signals, a sweep generator for producing a sweep signal over a predetermined range of frequencies and at a predetermined rate and a mixer for mixing the sweep signal with the received radar signal for producing intermediate frequency (IF) signals. A bandpass filter passes only those IF signals within a predetermined frequency band and a detector responds to the IF signals passed by the bandpass filter by producing corresponding output pulses. A control circuit is responsive to a pair of output pulses being produced for each of three successive cycles of the sweep signal and to both the first pulse and the second pulse of each pair of pulses occurring at the same time intervals respectively relative to the corresponding cycle of the sweep signal for producing a warning signal.

Abstract: A radio direction finding system comprises a receiving portion for receiving a radio signal and a direction determining portion coupled to the receiving portion for developing a direction signal corresponding to the direction of arrival of a received radio signal. A memory is also provided for storing direction data corresponding to the direction of arrival of at least one received radio signal, and a control circuit is coupled intermediate the direction determining portion and the memory for producing direction data corresponding to the direction signal for storage by said memory. In accordance with a further aspect of the invention, an indicator is provided for actuation by the control circuit to produce an observable indication of the direction of arrival of a received radio signal, and the direction finding system further includes an EPIRB detector portion for producing an EPIRB reception signal in response to reception of an EPIRB signal.

Abstract: A horn antenna comprises a horn of the type including a rectangular throat, a rectangular opening located in a plane parallel to and spaced part from the throat and having at least one dimension larger than a corresponding dimension of the throat, and four wall portions joining the throat and the opening. An electrically conductive member is disposed so as to define any one diagonal across the horn from and including the opening to and including the throat.

Abstract: A slide switch comprises a plurality of sets of aligned terminals, each set comprising at least a center terminal and two end terminals, one to either side of the center terminal and aligned along a common axis therewith, and a plurality of elongate slides respectively associated with the sets of terminals. The slides are of sufficient length to engage the center terminal and only one of the associated end terminals. An actuator mounts the slides for movement between a first position wherein the slides electrically couple each of the center terminals with one of its associated end terminals and a second position wherein the slides electrically couple each of the center terminals with the other of its associated end terminals. A light emitting element has a pair of electrodes and is responsive to a given voltage across the electrodes for emitting light.

Abstract: A dual frequency band radar detector responds to radar signals occurring within either of a first or a second range of frequencies. The detector comprises one or more antennas for receiving radar signals including radar signals occurring within the first and second ranges of frequencies. At least one pilot signal at a predetermined frequency is produced for modulating the received radar signals. The modulated signals produced in response to received signals in either of said first range of frequencies or said second range of frequencies are isolated. A detector is coupled in circuit for detecting the one pilot signal in these isolated and modulated signals and a control output signal is produced responsive to the detected pilot signal. Accordingly, the presence of a control output signal indicates the reception of radar signals occurring within at least one of the first and second ranges of frequencies.

Abstract: A micrprocessor-controlled, frequency-synthesized radio transceiver system comprise a microprocessor for controlling the synthesis of local-oscillator frequencies for both the transmitting and receiving of radio signals. The microprocessor has a predetermined control capacity significantly smaller than the capacity required to control the synthesis of local-oscillator frequencies for a first plurality of radio frequencies. A transmitter circuit and a receiver circuit are capable of operating at all radio frequencies within the same predetermined band of frequencies. A control input arrangement permits customizing the microprocessor to control the synthesis of local-oscillator frequencies for a second plurality of radio frequencies within its predetermined control capacity.

Abstract: A power-saving relay circuit for reducing power consumption from a power supply comprises a relay including a selectively energizable relay coil, a plurality of movable contactors, and a plurality of fixed contacts including first and second fixed contacts associated with each of the movable contactors. Each of the movable contactors is normally in electrical contact with the first fixed contact and responsive to energization of the relay coil for breaking the electrical contact with the first fixed contact and for making electrical contact with the second fixed contact. A current limiting circuit is coupled in electrical series circuit intermediate a selected one of the second fixed contacts and the relay coil. The movable contactor associated with the selected one of the second fixed contacts is capable of being coupled in circuit with the power supply for completing an electrical circuit through the current limiting circuit for energizing the relay coil.

Abstract: A waiting time display system comprises a plurality of remote stations each including a waiting time display unit comprising a display portion for producing a visual display corresponding to waiting time and a control unit comprising control means selectively actuatable for producing predetermined output signals corresponding to a selected waiting time. A centralized monitoring unit is also provided and is responsive to the output signals from each control unit for monitoring the waiting time displayed on each display unit. A plurality of transmission lines coupled intermediate each of the control units and its associated display unit and intermediate each of the control units and the centralized monitoring unit for transmitting the output signals from each control unit to its associated display unit and to the centralized monitoring unit, respectively.

Abstract: A system is provided for transmitting data from at least one control position to at least one remote display position over a plurality of transmission lines coupled between the control position and the display position. These transmission lines include a common power supply line, a ground line and a number M of conductors. Each conductor is used for transmitting one or more of a number N of different data. The display position includes a number R of display characters. The invention provides circuits for transmitting N data on M transmission lines to actuate a given combination of R display characters corresponding to each of the N data wherein both R and N are greater than M so that the transmission lines are fewer in number than either the number of data or the number of display characters.

Abstract: YAn amplified video signal distributing apparatus is provided which has a plurality of input terminals. An associated plurality of input signals are applied thereto for selective application to at least one utilization device which is coupled to the output of the apparatus. The apparatus comprises a primary input terminal, a plurality of secondary input terminals, switches for selecting the signal which appears at one of the secondary input terminals, at least one output terminal, and a signal generator for generating a primary control signal and a secondary control signal. A controllable switch is responsive to the primary control signal for coupling the primary input terminal to at least one of the output terminals and is responsive to the secondary control signal for coupling the signal selected by the selecting switches to at least one of the output terminals.

Abstract: An antenna defines a coaxial connector receptacle when the antenna is in a fully retracted position.

Abstract: An antenna comprises an antenna body telescopically movable between a fully retracted position and a fully extended position and having a free end. A BNC-type coaxial receptacle is mounted to the free end of the antenna body. A mounting base receives the BNC-type coaxial receptacle when the antenna is in the fully retracted and completes an electrical ground circuit to the BNC-type receptacle.

Abstract: A signal distribution apparatus for selectively coupling each of a plurality of inputs to one or both of two outputs substantially without interference between the inputs or the outputs. The signal distributing apparatus comprises a plurality of input terminals and balanced couplers, such as balun coils, for providing a balanced line from each input terminal. A switching network is coupled intermediate the balanced couplers and the two outputs for selectively and individually coupling each balanced line to one or both of the outputs.