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A comment on New LoRa RF distance record: 1336 km / 830 mi.

Re:New LoRa RF distance record: 1336 km / 830 mi by ricardobeat on Thursday September 07, 2023 @05:13AM (#37416480)
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?

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Re:New LoRa RF distance record: 1336 km / 830 mi by MrOxiMoron on Thursday September 07, 2023 @05:37AM (#37416624)
probably the same amateur radio people can connect to people halfway across the globe; bouncing off an atmospheric layer.
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Re:New LoRa RF distance record: 1336 km / 830 mi by catbert69 on Thursday September 07, 2023 @05:59AM (#37416755)
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.

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Re:New LoRa RF distance record: 1336 km / 830 mi by catbert69 on Thursday September 07, 2023 @05:58AM (#37416751)
99% this was atmospheric ducting. Also LoRa is an incredibly robust modulation.
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Re:New LoRa RF distance record: 1336 km / 830 mi by jacquesm on Thursday September 07, 2023 @08:12AM (#37417787)
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.
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