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>Subcarriers are how they added [...] stereo to FM radio...

Set your time machine for 1958, or follow this link [0] to see how RCA did both FM stereo (throughout the article they call it "multiplex") and 67 KHz "SCA" subcarriers. Admire the awesome 5KW FM transmitter cabinetry and transformer shielding.

[0] http://fmamradios.com/BTE-10B.html

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One thing I find particularly interesting about articles from this time period is that Hz is not yet the name for 1/s, and so everything is in "cycles per second".

According to Wikipedia, the transition started in 1960, so we're two years away when this article was published.

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