STUDY OF PATTERN GENERATOR AND ITS USE

May 14th, 2015
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A pattern generator produces audio / video signals, direct and with the RF modulation, on the allocated T.V. Channel frequencies for alignment, testing and servicing of T.V. receivers. The output signals is designed to simple patterns.

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About Wobbuloscopy( Downloaded File)T.V. Servicing Lab - II11. STUDY OF PATTERN GENERATOR AND ITS USEAim :To study the pattern generatorOperettas Required :Pattern generator, T.V. Receiver, connecting wires.Theory :A pattern generator produces audio / video signals, direct and with the RF modulation, on the allocated T.V. Channel frequencies for alignment, testing and servicing of T.V. receivers. The output signals is designed to simple patterns.1. Chess board pattern2. Horizontal bars3. Vertical bars4. Chess board patter at one corner5. Cross hatched6. Dot pattern7. Pure white patternBlock Diagram :The block diagram of the pattern generator given below.The pattern generator contains two stable chains of multi vibrators, dividers and pulse shaping circuits, one below the line frequency to produce a series of horizontal bars and the other above 15,625 Hz to produce vertical bars. The signals are modified into short duration pulses which fed to the video section of the receiver along with the sync pulses train to produce fine lines on the screen. Output from the multi vibrator produces square wave video signal at m times the horizontal frequency to provide vertical block and white bars. After every m cycles the horizontal blanking pulse triggers the multi vibrator for synchronizing the bar signal on each line. We can vary the number of bars by the front panels of pattern generator by changing its frequency. In the same way, square wave puls

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