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Manfred von Ardenne, a German television engineer, began experimenting with CRT receivers in 1930. Using mechanical scanners, he produced good quality images using CRTs.
In April of 1931 von Ardenne had made a flying spot film scanner. It produced a 60 line picture, using a horizontal scan rate of 1500 Hz. and a vertical scan rate of 25 Hz. An 8000 volt power supply was used on the CRT.
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A block diagram. Notice that the scanner is connected directly to the
monitor CRT. The signal was not broadcast.
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Here is a block diagram of a scanner with sync pulses added to the
video, for possible broadcast.
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