Abstract: A microcomputer-controlled thermostat for use in monitoring and controlling a single zone HVAC system which provides conditioned air to one or more zones. The thermostat can be programmed and used either as a monitor thermostat to control the HVAC unit alone and/or to control the HVAC unit and its damper in a multiple zone mode. The thermostat is also programmed as a slave thermostat in a master-slave relationship with a monitor thermostat. The microcomputer memory is supplemented with additional ROM containing control algorithms for use in system operation. Logic circuitry is used to recognize commands as being for operation of the HVAC unit, the operation of the damper, or selection of which systems sensors are to be enabled. A real time clock circuit in the monitor thermostat is used to supply data for time-based system operation.

Abstract: Heating pattern uniformity is provided in a coaxial microwave hyperthermia probe by varying the open area in the outer conductor in an axial direction such that there is a maximum open area in the axial center portion. The variations may be provided by winding an outer conductor in a helical pattern with a variable pitch or by cutting openings of axially varying size in a solid outer conductor. The invention is applicable to both flexible and rigid probes.

Abstract: A regulator coupled to the main supply voltage generates a B+ scan voltage for a horizontal flyback transformer of a horizontal deflection circuit. A supply voltage is developed from a trace voltage in a flyback transformer secondary winding. The supply voltage is indicatiave of the horizontal deflection current amplitude. A decrease in mains supply voltage that cannot be compensated by the regulator, causes a corresponding decrease in the B+ scan and supply voltage and in a horizontal deflection current amplitude. The supply voltage is applied to the series arrangement of first and second resistors and a zener diode. A control voltage developed from the supply voltage, at a junction of the first and second resistors, is applied to a control terminal of a vertical deflection circuit for controlling the amplitude of the vertical deflection current. A decrease in the control voltage produces a greater proportional decrease in the vertical deflection current.

Abstract: Detection apparatus for alerting an operator of a moving vehicle to the proximity of a radio transmitter of known frequency and power, typically in a police vehicle. The detection apparatus includes a scanner radio having a selected channel set to the know frequency so that it provides a channel active signal during the time that the police vehicle transmitter is on. The detection apparatus further includes a timing circuit for generating a delay interval representative of the maximum time for the moving vehicle to pass the police vehicle and circuitry for generating a visual and/or audible operator alarm during the channel active signal and during the delay interval. The scanner radio is also utilized to monitor voice transmissions between the dispatcher and the police vehicle, thereby providing the vehicle operator with additional information regarding nearby police vehicles.

Abstract: A fuel measuring system of the bubble type is adaptable for use with a plurality of tanks of predetermined differing geometries. The system employs at least two bubbling tubes located at predetermined locations in a tank. A predetermined volume flow of air is made to pass through each tube. Pressure transducers are used to periodically measure the air pressures supplied to the bubbling tubes. Temperature is also periodically sampled, and the pressure and temperature data is used by a microprocessor to make the necessary computations to first determine the averaged normalized air pressure and then the height of the fuel in the tank. In order to correlate the computed value of fuel height with the actual quantity of fuel in the tank, the microprocessor accesses data in a table lookup memory for the particular tank and performs calculations in order to derive the instantaneous volume of fuel in the tank.

Abstract: A current limiting control circuit for a d.c. motor, wherein compensation is provided for the inherent voltage drop across the armature of the d.c. motor with a first dedicated amplifier, while a second dedicated amplifier provides current limit control. In providing a separate and dedicated amplifier for the current limiting function, the limitations inherent in the current/resistance compensation circuit, such as lag in response time, are avoided.

Abstract: An optically transmissive, substantially cylindrical enclosure surrounds a light source. A generally circular base includes a vertically oriented first flange section dimensioned to fit coaxially within a vertically oriented lower section of the enclosure. The base includes a horizontally oriented, second flange section coupled to the first flange section and oriented perpendicular to the longitudinal axis of the lightining fixture. A circular clamp compresses a resilient gasket between a lower, horizontally oriented surface of the enclosure and the horizontally oriented second flange section of the base to create an hermetic seal between the base and the light fixture enclosure.

Abstract: A resistive element consisting of a metal film, or metal film substitute, comprised of nickel and chromium and which may include aluminum. To this element is added a member of the group consisting essentially of a rare earth element and a transitional element.

Abstract: An electrical switch assembly comprises a first, domed, flexible contact member plus at least one second, flexible, finger-type contact member positioned under the first contact member in normally spaced relation thereto. Actuator means are provided for pressing the first, domed contact member into contact with the second contact member to actuate the switch assembly. In accordance with this invention the second, flexible, finger-type contact member defines an end portion which is bent to permit increased-area contact with the first contact member when the first contact member is pressed into contact with the second contact member. This also provides improved wiping action between the first and second contacts as the increased-area contact is made and broken for removal of carbon build-up and the like.

Abstract: A zero insertion force socket using normally closed contacts and three adjacently overlying plates. Upon lifting the activating arm, a cammed cylinder is rotated which pushes the middle plate and pulls the top plate to thereby open the prongs of the contact for component lead insertion therebetween. Upon the activating arm being moved back into its original position the cammed cylinder rotates and the middle plate shifts back to its original position under the influence of a contact prong closing about the component lead as the top plate shifts back to its original position under the influence of the cammed cylinder.

Abstract: A snap-n-seal connector for coaxial cables includes a connector body, an annular compression sleeve and optionally, a sealing nut. The connector body includes an annular collar member which peripherally engages the jacket of a coaxial cable, a post member coaxially disposed within the annular collar member to engage the dielectric insulation and the braided shield of the coaxial cable, and a rotatable nut member disposed in combination with the collar and post members. The connector body further includes a sealing member disposed between the collar and nut members to form a moisture-proof seal therebetween and an annular contact spring member seated within the collar member and circumferentially disposed about the post member to engage the braided shield of the coaxial cable.

Abstract: A stereo expansion circuit selection switch includes a transmission gate to cross couple the right and left channels as needed for stereo expansion.

Abstract: A microcomputer-controlled bypass controller for use in maintaining a minimum airflow through a heating/cooling unit and limit the static pressure in the supply air truck duct. The bypass controller functions to control the operation of a bypass damper which regulates the airflow through a duct that bypasses air from the supply truck duct to the return. The bypass controller also measures the air flow via an air flow sensor and communicates with a microcomputer-controlled thermostat to coordinate transitions between heating and cooling cycles in association with a second sensor which monitors the duct temperature.

Abstract: A telephone maintenance termination unit utilizes a low voltage, bidirectional trigger switch for performing diagnostic functions on a telephone line. The trigger switch provides low voltage, low current triggering in conjunction with a high holding current requirement. The trigger switch may comprise either two silicon controlled rectifiers connected in inverse parallel relationship with their gates connected, a bidirectional diffused PNPN semiconductor device, or an NPN semiconductor device, any one of which is used to trigger a power control TRIAC. In another embodiment, the switching device may be a two-terminal, unitary semiconductor device incorporating the functions of both the TRIAC and the bidirectional trigger switch.

Abstract: A high voltage generator of a television receiver includes a high voltage transformer having primary and high voltage windings. The high voltage winding is coupled to an ultor terminal of a picture tube via a high voltage rectifier. Retrace pulses applied to the primary winding are stepped up by the high voltage winding for generating an ultor voltage. A source of supply voltage is coupled to a current resupply terminal of the high voltage winding and produces voltage pulses at the resupply terminal having amplitudes which vary in accordance with ultor voltage loading. An envelope detector is coupled to the resupply terminal for envelope detecting amplitude variations of the voltage pulses to develop a size control signal which follows loading induced variations in ultor voltage. The size control signal is coupled to a scanning current modulator, such as a diode modulator, for modulating the scanning current in a manner that regulates the raster size.

Abstract: An apparatus for manufacturing a glass stem for an electron tube comprises a first mold assembly and a second mold assembly for forming the stem therebetween. The glass stem includes a plurality of fillets with a lead-in conductor through less than all of the fillets and at least one dummy fillet without a lead-in conductor therethrough. The first mold assembly includes a universal stem having a mold block with fillet-forming openings therein. A replaceable marker pin is disposed and retained within the openings. The marker pin has a first end and an oppositely disposed second end. The first end has a distinctive geometric shape for contacting the dummy fillet and for conveying intelligible information thereto.

Abstract: A theft-notifying method is applicable for a motor vehicle having a motor vehicle telephone system and a theft-alarm system. The method comprises the steps for pre-storing into a memory telephone numbers of a notifiee to which an alarm is sent when a theft occurs. When theft is detected, the theft-alarm system signals the theft condition to the vehicle telephone system. The vehicle telephone system then automatically dials a notifiee whose telephone number is stored in the memory. A vehicle owner is thus notified of the abnormality and take measures for the prevention of theft even at night or even when nobody is near the vehicle.

Abstract: An improved instrument for determining the distance to an open fault in a communications line, the instrument taking advantage of the predictable relationship between the current discharge rate in a reference capacitor and resistor and the current discharge rate in a faulty line whose capacitance is a function of the distance to the fault. Provisions are made to keep the meter readings within the usable scale of the meter of the invention by allowing the operator to select from among a range of driving signal frequencies to suit the distance to the fault. Calibration may be made by reference to an internal capacitor or by means of measuring a known length of open circuited line of the type to be tested. Provision is also made to provide for "tuning out" "dirty" short circuits.