[ricardobeat]

How does this work?

At this distance you need a 130km-high tower for line of sight due to earth’s curvature. The previous record was set on a balloon flying at 38km height. LoRa uses high frequencies so shouldn’t benefit from the ground effect?

[MrOxiMoron]

probably the same amateur radio people can connect to people halfway across the globe; bouncing off an atmospheric layer.

[catbert69]

That doesn't work well on 433MHz oder 868MHz. Ionosphere reflection stuff usually happens <30MHz.

On VHF/UHF it's usually atmospheric ducting where radio signals are getting reflected between two layers of air.

[catbert69]

99% this was atmospheric ducting. Also LoRa is an incredibly robust modulation.

[jacquesm]

It's a one-off, you won't be able to achieve this with any degree of reliability in practice, but it's a nice milestone achievement.