Re: Dux/Philips Swedish TV-Radiogram!
It'll be some trick involving the AGC voltage, which increases with received signal strength; and a voltage developed across a resistor in series with the line scan coil, which increases as the beam moves across horizontally, passing through 0V at the middle of the screen.
It's certainly a neat idea, using the cathode ray tube as its own tuning indicator!
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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