eli5: On old radios, how does turning the dial tune into a different station? what is happening inside the radio to achieve this?
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The radio technically receives all frequencies at all time, but the tunning system is essentially a very fine filter that only lets through the frequencies you want to listen to.
If you’d imagine frequencies like swinging on a swingset, if you pull just at the right time you’ll accelerate, but if you push or pull at the wrong time you’ll actually slow down.
When you tune the radio you’re changing when and where these capacitors push and pull the radio signal so you amplify the frequency you want to hear and filter out all others
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