| 21. | WSKY-DT started broadcasting a test pattern on November 24, 2007.
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| 22. | At 5 : 59PM, the test pattern gave way to a solid black screen.
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| 23. | Clogged nozzles can be detected by printing a standard test pattern on the page.
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| 24. | About 24 hours after the attack, the program was replaced with a test pattern.
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| 25. | It's the night that networks other than NBC would just as well run test patterns.
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| 26. | Monoscopes were used beginning in the 1950s to generate TV test patterns and station logos.
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| 27. | The station eventually began broadcasting a test pattern on 19 June 1999 on UHF 41.
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| 28. | However, functional test patterns don't discover common fabrication faults.
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| 29. | By September 4, 2009, it was broadcasting a color test pattern with its call sign.
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| 30. | Since then, Simpson's face has shown up on TV more often than a test pattern.
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