Abstract: An animal control apparatus (10) with a collar based receiver (20) wirelessly linked to a stimulator (110) attached to the animal's ear. In a preferred embodiment, the receiver broadly comprises a GPS component (30); a wireless transmitter (40); a receiver processor (50); a power supply 60; and an attachment mechanism (80). The stimulator (110) broadly comprises a wireless receiver (120); a stimulation circuit (130); a stimulator processor (150); a stimulator power supply 160; and a stimulator attachment mechanism (180). The apparatus (10) is adapted to monitor an animal's location and deliver a corrective stimulus to the animal if the animal enters a restricted location.

Abstract: An animal control apparatus (10) with a collar based receiver (20) wirelessly linked to a stimulator (110) attached to the animal's ear. In a preferred embodiment, the receiver broadly comprises a GPS component (30); a wireless transmitter (40); a receiver processor (50); a power supply 60; and an attachment mechanism (80). The stimulator (110) broadly comprises a wireless receiver (120); a stimulation circuit (130); a stimulator processor (150); a stimulator power supply 160; and a stimulator attachment mechanism (180). The apparatus (10) is adapted to monitor an animal's location and deliver a corrective stimulus to the animal if the animal enters a restricted location.

Abstract: A method and apparatus determines the output voltage of a power source necessary to produce a desired lamp voltage at an incandescent lamp remote therefrom using voltage and current measurements at the power source for a circuit including a series resistor and a circuit without the resistor. Estimated circuit resistances are determined according to an algorithm that calculates the power source output voltage necessary to produce a desired lamp voltage at the lamp.

Abstract: Improvements in a fenceless electronic animal control system comprising portable stimulation units attached to the animal and rf transmitters defining an area, with the stimulation of the animal based on the transmission received by the portable unit. The transmitters transmit signals containing multiple codes to permit selective stimulation of pre-defined categories of animals and to insure a continuous electronic signal boundary. Portable units include the capability of transmitting signals in response to in inquiry signal from a separate transmitter thereby providing confirmation of the location and identify of the animal.

Abstract: A Radar Altimeter signal presence circuit which provides improved useable system sensitivity for a given false track probability by providing an improved method for detecting the adequacy of the return signal. This return signal is composed of many small, rapidly changing reflections that vary between additive and substractive combination giving the net return the characteristic of noise. A non-linear detector is used to enhance the signal presence detectors sensitivity to weak but adequate returns while (1) reducing the ability of short periods of strong returns to cause a positive signal presence indication when the overall signal is inadequate, and (2) retaining a high sensitivity to periods of signal fades that produce measurement errors. This is accomplished by using a non-linear detector that reduces the effect of strong returns when the many small reflections tend to combine additively, and increases the effect of weak returns when the many small reflections tend to combine subtractively.

Abstract: A Radar Altimeter static accuracy circuit which provides improved system accuracy when the altimeter platform is stationary over the ground. Most often this stationary condition occurs in helicopters while hovering at low altitudes but also occurs, for example, in altimeters used to measure the level of grain in elevators. The altimeters output, a voltage proportional to altitude, is used to control a voltage controlled oscillator (VCO), the output of which is summed into the receiver intermediate frequency (IF) amplifier output to fill in the return signal fades. These fades otherwise cause altitude processor errors leading to erroneous altitude measurements. The VCO is adjusted to produce an output frequency equal to the IF amplifier output frequency.

Abstract: A transistorized active switch radar pulse modulator has a unique means for pulse current control which includes a transformer interconnected with a magnetron. Transistor switches and related circuitry pulse a step up transformer with voltage pulses to drive the magnetron with a desired current pulse having the appropriate shape and width. A capacitor in the secondary of the transformer acts as a load to the transformer prior to the conduction level of the magnetron so that no current transients occur after the magnetron fires. Suitable protective features operate to sense an arcing condition and to dissipate the arcing effects. A unique slope control circuit insures that the requisite flat current pulse drives the magnetron.