[chbot] LoRa peer to peer

[Stephen Irons]

Some experience a few years ago using HopeRF RFM95W (I think it was), 
which uses SX1278 internally, at 915 MHz (λ= 328mm), with a trivial 
raw-LoRa (LoRaw?) protocol.
About 450 m range
Tx: MIFA (meandering inverted-F antenna) PCB antenna about 500 mm 
(1.5λ) above the groundRx: 1/4λ (~80 mm) whip with no real ground 
plane, handheld about 1.5 m (5λ) above the groundSuburban environment: 
St. Martin's school to a nearby house, no direct line of sight with a 
few buildings in the way
About 100 m range
Tx and Rx: 1/4λ (~80 mm) whip with no real ground plane about 150 mm 
(1/2λ) above the groundGrass/bush/open forest environment at Macleans 
Island, trying to see how well it would work as link for a predator 
sensor, no line of sight
At least 1.5 km range
Tx and Rx: 1/4 wave (~80 mm) whip on 600 x 600 mm aluminium sheet about 
500 mm above the groundClear line of sight over Waimak river bed near 
Macleans IslandTo see whether I could actually get >1 km range.Stopped 
because I go bored walking down the river bed
The trick seemed to be proper antennas and clear line of sightI don't 
remember the LoRa spreading parameters, etc, but we had a reasonable 
data rate, not the very slowest.
Stephen Irons


On Tue, May 13 2025 at 14:59:01 +12:00:00, Robin Gilks 
<gb7ipd at gmail.com> wrote:
> I'm looking for a radio link that has a bit better range than an 
> NRF24L01 which I have found doesn't really make 100m reliably. Got 
> some sx1278 modules (for use on 433MHz) on order so I'll be able to 
> experiment but any pointers or experiences in other than LoRaWAN ?
> 
> Cheers
> 
> --
> Robin Gilks
> 

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