Abstract: An RF tuneable resonator wherein RF energy is applied to a helical coil and he resonant frequency of the resonator is varied by utilizing a pair of axially moveable dielectric cylinders. One dielectric cylinder surrounds the helical coil and the other dielectric cylinder is positioned within the coil. Both dielectric cylinders are individually actuated along the axis of the coil.

Abstract: A Doppler radar system in which quadrature Doppler signals are derived to eld directional information. The quadrature signals are derived by demodulating the return signals with respective odd and even harmonics of the sinusoidal signal used to frequency modulate the RF carrier.

Abstract: CW is beamed continuously by a radar and is sampled continuously in the rr; the radar continuously senses reflections that are returned to the radar. Only if the distance to a reflecting target is changing significantly per unit time is there an output generated; the output is a positive DC voltage if the distance is closing and a negative DC voltage if the distance is opening. An annunciator arrangement responds to the output DC voltage. Reflection frequency energy is mixed with a sampling of the CW to obtain the difference frequency. At the same time, reflection frequency energy is mixed with +90 degrees phase advanced sampling of the CW to obtain the difference frequency. The phase angle between the two difference frequency outputs is increased by +90 degrees and then are channeled to an analog multiplier. The DC output of the analog multiplier operates an annunciator. A much wider range of doppler frequency (viz.

Abstract: A sensing system for use in a remote location which detects electromagnetic adiation energy, the system being self-activating, turning itself automatically on and off, as a function of radiation intensity across the detector. In essence, when no radiation is present across the detector, the system will consume no power, the switches and MOSFET discriminator being essentially in an "off" position. Radiation across the detector provides a current to an input capacitance which when charged turns on the switch and the MOSFET discriminator. A switch driver produces an output pulse showing the presence of radiation; the system then shuts off awaiting the next radiation input. Since the sensor system uses virtually no power unless radiation is present, it is ideally suited for use in remote environments where battery power and size is a predominant consideration.