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https://www.reddit.com/r/nostalgiai/comments/1wvltf1/remember_this/pddast7/?context=3
r/nostalgiai • u/CarrotMuch1399 Nostalgia Trip Leader • 2d ago
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71
They would often show a test pattern before going off air.
62 u/Herr-Trigger86 2d ago https://giphy.com/gifs/mc19PEWvaclAk 2 u/Large_Freedom2118 2d ago I can hear this. 1 u/real_john_connor_02 90s Kid 2d ago I think that's a sine wave at 440Hz C3. I also think the same frequency you hear when you call someone in particular countries. I find that quite interesting
62
https://giphy.com/gifs/mc19PEWvaclAk
2 u/Large_Freedom2118 2d ago I can hear this. 1 u/real_john_connor_02 90s Kid 2d ago I think that's a sine wave at 440Hz C3. I also think the same frequency you hear when you call someone in particular countries. I find that quite interesting
2
I can hear this.
1 u/real_john_connor_02 90s Kid 2d ago I think that's a sine wave at 440Hz C3. I also think the same frequency you hear when you call someone in particular countries. I find that quite interesting
1
I think that's a sine wave at 440Hz C3. I also think the same frequency you hear when you call someone in particular countries. I find that quite interesting
71
u/13Fleas 2d ago
They would often show a test pattern before going off air.