Nice app and writeup - but she won't have a radar - she'll have an app that disp... | Hacker News

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		RachelF on Nov 27, 2023 \| parent \| context \| favorite \| on: My toddler loves planes, so I built her a radar Nice app and writeup - but she won't have a radar - she'll have an app that displays the positions of airplanes. A true radar needs to transmit and receive. The SDR is still just listening to the telemetry from the plane, which they transmit all the time for this ADS mode.

empyrrhicist on Nov 27, 2023 | [–]

You can have passive radar:

https://en.wikipedia.org/wiki/Passive_radar

But yes, it needs to be doing more than receiving telemetry to qualify, and there has to be something transmitting.

jakey_bakey on Nov 28, 2023 | [–]

TIL what a radar is :)

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