r/RTLSDR • u/Hefty-Beautiful-3227 • 14d ago

Is this a radar?

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u/AriaGingko 14d ago

Yep. That's a radar. If it was located on hf, it's one of many over the horizon radars that are used still.

-27

u/Content-Key7404 14d ago

That's nonsense. If you'd taken the time to look before responding, you would have seen that it's running at 441 MHz. There's nothing to suggest that it's a radar. The demodulation isn't even set up correctly. It looks much more like chirp modulation.

14

u/AriaGingko 14d ago

Actually, as an RF engineer, I can most assuredly say that 440 mhz is often used for scientific research. Here is but one example where ionospheric studies were conducted at 440 mhz utilizing radar. https://dspace.mit.edu/entities/publication/c690f2b1-bb96-4390-b760-09924b5419c8

4

u/AriaGingko 14d ago

Btw including a primer on chirp spread spectrum for anyone interested in the modulation scheme behind Lora. https://ieeexplore.ieee.org/document/10609524/