[mikewarot]

Magnetrons are basically like a sportsball coach's whistle, except it's electrons instead of air resonating.

The filament in them apparently lasts for decades, as you can usually find working Microwave ovens at yard sales for $20.

On the other hand, this is essentially most of a phased array radar, with all the attendant cost and complexity. The costs will come down, but not anywhere close to that of the magnetron.

[londons_explore]

The website doesn't provide a lot of technical detail, but I don't think there is any phased array stuff going on - there is just one transmit antenna, and it's measuring the reflected energy and using that to decide how to adjust the frequency and power.

It's really just a high power version of a 50 cent doppler radar unit [1].

[1]: https://www.aliexpress.com/item/32861277615.html