Mystery signal from a helicopter

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I love Oona Räisänen's blog. She's my hero. She combines a love of figuring stuff out with lots of fun hacks. And when I read her blog it makes me happy to see someone with that joy of uncovering mysteries.

Indeed--it was more of a hack sixty years ago perhaps. Since then, similar tricks have been used for closed captions, Dolby surround (the original kind), Radio Data System (which puts song names on your car dashboard via FM radio), TV Second Audio Program (listen to shows dubbed in a second language, just press the SAP button on your ancient high-end TV!)....

You can basically reverse those terms for me. I'm a mech engineer who wished he knew more/was better at the web-dev / big data stuff.

And here I always consider myself paranoid when wondering whether odd patterns in anything mean anything. Guess I'm just too noob and inpersistent to find anything.