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polarized - Purdue Physics
polarized - Purdue Physics

... classified according to their frequency and wavelength  The wave equation is true for EM ...
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SGA6589Z 数据资料DataSheet下载

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Experiment 4: Damped Oscillations and Resonance in RLC Circuits
Experiment 4: Damped Oscillations and Resonance in RLC Circuits

... The other parameter, ω0, is the natural frequency of the system; that is, if the damping is reduced to almost zero, the system would oscillate with frequency ω0. In general, even with damping, the oscillation frequency is almost equal to ω0. If we compare the RLC and harmonic oscillator equations, ...
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... 6e. The Circuit Output Turn on the amplitude modulation of the Wavetek generator for these finals tests. Testpoint g should show the same AC signal as at testpoint e, but with no DC level. The AC signal here should still show the 1 MHz oscillations within the halfwave form due to the rectification o ...
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F:\Instrumental Considerations.wpd
F:\Instrumental Considerations.wpd

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Heterodyne



Heterodyning is a radio signal processing technique invented in 1901 by Canadian inventor-engineer Reginald Fessenden, in which new frequencies are created by combining or mixing two frequencies. Heterodyning is used to shift one frequency range into another, new one, and is also involved in the processes of modulation and demodulation. The two frequencies are combined in a nonlinear signal-processing device such as a vacuum tube, transistor, or diode, usually called a mixer. In the most common application, two signals at frequencies f1 and f2 are mixed, creating two new signals, one at the sum f1 + f2 of the two frequencies, and the other at the difference f1 − f2. These new frequencies are called heterodynes. Typically only one of the new frequencies is desired, and the other signal is filtered out of the output of the mixer. Heterodynes are related to the phenomenon of ""beats"" in acoustics.A major application of the heterodyne process is in the superheterodyne radio receiver circuit, which is used in virtually all modern radio receivers.
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