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Old 8th Aug 2012, 3:26 am   #13
julie_m
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Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
Default 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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