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#2
08-24-2015, 12:46 AM
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This ultra simple approach to test pattern generation reminds me of the crosshatch (grille) generator I built c1975 from a design published in a UK journal. It used about 4 simple TTL chips and relied on extracting sync pules from the TV you were working on. Simple as it was, it allowed me to converge my first ever colour TV.
Hardly surprising that the simple grey scale generator is rejected by modern TVs. It's taking severe liberties with the waveform, including absence of field sync pulses. 
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