Abstract: A vehicle wheel alignment system has a plurality of cameras, each camera for viewing a respective target disposed at a respective wheel of the vehicle and capturing image data of the target as the wheel and target are continuously rotated a number of degrees of rotation without a pause. The image data is used to calculate a minimum number of poses of the target of at least one pose for every five degrees of rotation as the wheel and target are continuously rotated the number of degrees of rotation without a pause. At least one of the cameras comprises a data processor for performing the steps of preprocessing the image data, and calculating an alignment parameter for the vehicle based on the preprocessed image data.

Abstract: A roofing tool and method of using same is disclosed. Said tool eliminates safety concerns and reduces the time to shingle a mansard. The tool includes a handle, means for gripping a shingle, one or more elongated members, and alignment fixtures for accurately attaching shingles. A roofer applies pressure to an upper grip of the handle traversing a control rod in the direction of the handle rotating control arms connected to an upper jaw of the gripping means. The roofer places a shingle between the upper jaw and a lower jaw and releases the pressure upon the handle. Said pressure release causes, by means of a tension spring, the upper jaw to compress upon the shingle and lower jaw securing the shingle. Alignment tabs and stops insure the shingle and tool are aligned respectively. A method of using the tool includes a catch apparatus and elongated hammering tool.

Abstract: In modern communication systems, it has become important to provide filters, and in particular bandpass filters, which can provide substantially uniform group delay across the bandwidth of the filter while still achieving good amplitude response. In this regard, it is particularly desirable to substantially reduce the large variations in the phase characteristics found in conventional bandpass filters at the nominal band edge of the filter. To accomplish this, a filter is provided having at least one pair of lattice arms coupled in parallel to one another between the input and output of the filter. Each of the lattice arms includes a plurality of resonant LC resonators, each of the resonators having a different resonant frequency than the center frequency of the filter. In particular, within the bandwidth of the filter, the exponential damping coefficients for the resonators in each arm are set to decay at the same rate. This desired decay can be accomplished by exponential sizing of the components.

Abstract: A passive transmitter incorporates a parametric device, e.g. a varactor diode. A tuned circuit derives energy received from a source of radiowaves, and is coupled to pump the varactor diode. The varactor diode produces a subharmonic output. Means are coupled to the varactor diode to modulate the subharmonic signal, and the modulated subharmonic output may be transmitted without amplification.