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... weatherproof case for the LNA and is built from 0.5mm thick zinc-plated steel sheet. This material can be easily formed and then soldered together using conventional soft-solder techniques. As first, a disk of 120mm diameter is cut out and the required holes are drilled in the disk. Then the inner ( ...
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... 5. A capacitive transducer circuit used for measurement of linear displacement. T he transducer of parallel plate air capacitor wherein the capacitance can be changed by changing the distance between plates. This transducer is to be used for dynamic measurements. Suppose a flat frequency response wi ...
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Chirp spectrum



The spectrum of a chirp pulse describes its characteristics in terms of its frequency components. This frequency-domain representation is an alternative to the more familiar time-domain waveform, and the two versions are mathematically related by the Fourier transform. The spectrum is of particular interest when pulses are subject to signal processing. For example, when a chirp pulse is compressed by its matched filter, the resulting waveform contains not only a main narrow pulse but, also, a variety of unwanted artifacts many of which are directly attributable to features in the chirp's spectral characteristics. The simplest way to derive the spectrum of a chirp, now computers are widely available, is to sample the time-domain waveform at a frequency well above the Nyquist limit and call up an FFT algorithm to obtain the desired result. As this approach was not an option for the early designers, they resorted to analytic analysis, where possible, or to graphical or approximation methods, otherwise. These early methods still remain helpful, however, as they give additional insight into the behavior and properties of chirps.
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