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Voltage Time Base Generators Pdf Free

 
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MessagePosté le: Sam 1 Oct - 07:18 (2016)    Sujet du message: Voltage Time Base Generators Pdf Free Répondre en citant




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Voltage Time Base Generators Pdf Free


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In the simplest version of a radar display, today known as an "A-scope", a time base generator sweeps the display across the screen so that it reaches one side at the time when the signal has travelled the radar's maximum effective distance. To display such a signal on an oscilloscope for examination, it is desirable to have the electron beam sweep across the screen so that the electron beam cycles at the same frequency as the carrier, or some multiple of that base frequency. In UK terminology, these were known as strobes. The result is a visual re-creation of the original waveform. Use in television[edit].

403 Forbidden.. One sweeps the beam horizontally from left to right at 15,750 times a second, the time it takes for one line to be sent. It is the ability for the electron stream to be rapidly moved using the deflection plates that allows the CRT to be used to display very rapid signals, like those of a television signal or to be used for radio direction finding (see huff-duff). Radio signals, for instance, have a base frequency, the carrier, which forms the basis for the signal. A typical radar system broadcasts a short pulse of radio signal and then listens for echoes from distant objects. A time base generator, or timebase, is a special type of function generator, an electronic circuit that generates a varying voltage to produce a particular waveform. To display the signal, two time bases are used. For instance, if a particular radar has a time base of 1 millisecond, then its maximum range is 150km. If one examines a television broadcast on an oscilloscope, it will appear to be a continual sequence of modulated signals broken up by short periods of "empty" signal.

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MessagePosté le: Sam 1 Oct - 07:18 (2016)    Sujet du message: Publicité

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