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The Superheterodyne Radio: No really, that's its name

Technology Connections3 HN recommenders · 2019–2024
987K views · explainer · evergreen · Uploaded 2018-12-25

Technology Connections explains why the superheterodyne radio has its name and how mixing frequencies lets it tune stations well. It walks through the underlying wave phenomena and algebra and why the design solved a hard tuning problem.

HN people use it as the accessible go-to explainer for the superhet trick whenever radios or signal processing come up.

Electronics & circuit designInformation theory & signal processingAudio & video engineering

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3 comments from Hacker News

@rhinoceraptor2019 · in “Roaring 20s Superhets”

Heterodyne is a signal processing technique, and superheterodyne is an application of that for radio tuning. This video is a great explainer (and I also highly recommend every other video on the channel): [VIDEO]

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@wkjagt2024 · in “Radios, how do they work?”

This reminds me of a really cool video on superheterodyne receivers that Technology Connections did. [VIDEO]

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@benkuykendall2024 · in “An adjustable filter that can prevent interference in the range 600 MHz to 6 GHz”

This kind of work sounds potentially (?) important for continuing to improve network technology. Unfortunately I don't have the background to understand why it works in the slightest. However, it reminded me of an older approach to signal filtering that I just recently learned about: the superheterodyne radio receiver. It's a simple idea that enabled us to build cheap, tunable radios. YouTube video if you're curious: [VIDEO] . Definitely an accessible introduction to a neat trick in signal processing!

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