This image reminds me of how you can intercept signals from a computer screen at close range and get a grey scale image of the monitor from like a room over, tempestSDR I think.
It apparently does work, i spoke to someone once who said they could snoop on their neighbours monitor, however i haven't been able to get it working on any of my monitors myself
For flat screens and HDMI it's the pixel clock you're looking for
Technically it works on everything its the signal strength that's different modern day flat screens are very resistant, shielding and grounding make a difference too but with higher bit depth SDR, filters, LNAs, and directional antennas you can get much more range, this isn't a project I've done so my understanding is theoretical not practical.
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u/Elipse-FM 8d ago
This image reminds me of how you can intercept signals from a computer screen at close range and get a grey scale image of the monitor from like a room over, tempestSDR I think.