At VHF and up the only thing that really matters is line of sight. Everything else modulation wise is just frosting. Unless you're in a plane/balloon/etc or paying for power and location on a very tall building Lora isn't going to go any further than your 2.4 GHz wifi router.
These contrived setups for distant records (and using transient tropo ducting) are just for fun.
I've personally observed links through many buildings, over hills, and so forth that easily dwarf the range of the average 2.4Ghz link.
They specifically wanted something with a low barrier to entry. Take a look at the antenna they used. Pretty impressive imo.
True, and solar powered too, that is, put one on a pole and forget about it; not even the cost of changing the battery, just wiping the solar cell now and then if wind and rain don't do their job. The rechargeable one can be a supercap or an oversized cell so that when time will inevitably degrade its chemistry to an unusable state, the sensor will probably have ended its planned use life already.
Also, I've been part of the group looking at LoRa at Lancaster University for some time, and am currently working on part of a commercial deployment too. Here are a few papers published on the topic by Dr. Martin Bor, and occasionally myself (all the top ones are LoRa): https://scholar.google.co.uk/citations?user=WhN1gGwAAAAJ&hl=...
We live in the future.
I would agree it must be tropospheric ducting; I’m not aware of any other propagation mode that could be at work here.
There was a guy in one of the FM DXing groups on Facebook recently who posted a video of a French-language Canadian FM broadcast station he picked up from the Florida panhandle.
> It is a much slower method of still picture transmission, usually taking from about eight seconds to a couple of minutes, depending on the mode used, to transmit one image frame.
So for me main drawback of LoRaWAN is limited number of ACKed packets (gateway which can talk to thousands devices can use only 1% of airtime (simplified) and you have to divide it by number of users https://www.thethingsnetwork.org/docs/lorawan/duty-cycle.htm...), so you are allowed to have 10 packets per day. Any other data can be send in way called " send and pray"...
Would you build industrial device for telemetry while you can not be sure about your data? For example energy monitoring with 15 min periods. You can't be sure that your data arrives.
So ranges presented here is matter of luck but not reliable link.
Maybe ISM band limitations should adopt to LoRa which is more resistant to errors.
Or protocol should be changed (symphonylink has protocol for unlimited ACKed frames, OTA etc)
Just my 2 cents.