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2016-09-10 08:47  
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The main requirement for efficient de restoration is to provide a short time-constant during the clamp period, with a long time-constantlluring the active line time. The switch within the Harris HI201HS has an on resistance of 30 0 and the PM! buffer, BUF03, has an input resistance of 50 MO.

The tuned circuit presents a high impedance at the 4.43-MHz color subcarrier frequency so that the color-burst signal is retained if the video signal contains this information.

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