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The Television Test Pattern
January 1949 Radio & Television News

January 1949 Radio & Television News
January 1949 Radio & Television News Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio & Television News, published 1919-1959. All copyrights hereby acknowledged.

Remember the test patterns that used to be broadcast by over-the-air broadcast stations that were used to align the electron beam defection circuitry in CRT-based televisions? That pattern of squares, circles, parallel and radial lines was generated by a special tube called a "Monoscope" (RCA 2F21) on the transmitter end. Focus, 4:3 picture aspect ratio, linearity, frequency response, and contrast and brightness were all tweaked to optimize the pattern on the TV receiver circuitry. Of course not all sets were capable of obtaining a perfect alignment due to inferior design and/or a scheme by the manufacturer to provide a lower cost model with the tradeoff being a poorer picture - that was the type of TV we always had in my household as a kid (and today for that matter).

As a side note, can you imagine the heck that would be raised if an Indian chi