LoRa maximum range and speed - Page 1
Forum section: electronics / rf-microwave

author: jtronix
author_rank: Regular Contributor
timestamp: July 04, 2019, 10:14:41 am
content: Hi,I'm looking for wireless device which can send the log data to my PC. distance between PC and device will be around 3km.I have search few devices and I found that LoRa will be suitable for my requirement but not sure how much speed i will get at this distance?I'm planning to use Microchip's RN2903 device.Do I need RN2903 at both the ends. or some gateway IC required?? if yes can you suggest which will be suitable for my application?

author: frogg
author_rank: Regular Contributor
timestamp: July 05, 2019, 10:57:50 am
content: If you want P2P, using a module that isn't designed for LoRaWAN may be a better option.The Semtech SX1272/73/76/78 is dirt cheap and very popular.Most of the semtech modules seem to top out at 20dBm output (100mW). There seems to be a bunch of boards out there using this module claiming 30dBm output (1W) - maybe they have amps built in?

author: borjam
author_rank: Unknown
timestamp: July 05, 2019, 11:00:01 am
content: I have tried the Semtech ones (for example with Pycom microcontrollers) and they can be made to work in peer to peer mode very easily.However, remember that there are legal restrictions to the duty cycle on the 867 MHz ISM band.

author: jtronix
author_rank: Regular Contributor
timestamp: July 05, 2019, 11:10:15 am
content: Thanks for reply.. how much speed you got at 3km distance?

author: borjam
author_rank: Unknown
timestamp: July 05, 2019, 11:23:05 am
content: Quote from: jtronix on July 05, 2019, 11:10:15 amI haven't tried long distances, I mostly checked them from the software point of view. Anyway your actual performance will depend on topography, equipment placement, antennas, etc.If you want to do a quick and dirty test I would recommend you go have a look at the Pycom (http://pycom.io) microcontrollers.

author: frogg
author_rank: Regular Contributor
timestamp: July 05, 2019, 09:15:09 pm
content: Hope this helps. You have to take into account a number of variables with LoRa and the throughput is highly variable.

author: 0culus
author_rank: Super Contributor
timestamp: July 05, 2019, 09:52:21 pm
content: Quote from: frogg on July 05, 2019, 10:57:50 amYes, they do. I'm working on a project using some of these modules right now. With the power amp off, they top out at +22 dBm, and the amplifier gives you another 8 dB and a LOT more heat.

author: MarkF
author_rank: Super Contributor
timestamp: July 05, 2019, 09:57:55 pm
content: I just posted this comparison and range test (@ time 5:30) a few weeks ago:300 meters. Not 3000 meters.

author: Lord of nothing
author_rank: Super Contributor
timestamp: July 06, 2019, 11:12:31 am
content: If you are in Europe you can use a CB Radio with an Sound Modem!Sure the are damn slow but you can Operate on SSB with 12W pep.The most Stationary CB Radio put out 10W.And with a Sound Modem you can do a lot of nice thinks.On CB is no Duty cycle and you can send Encrypt stuff. I was annoyed a lot of CB User by send 1W in constant and Data Stream via CB to a Friend.

author: ghost1325
author_rank: Contributor
timestamp: July 18, 2019, 02:41:09 am
content: 3000 meters？ I think it will be OK in an open space. attached images is a couple of LoRa P2P device. As you can see , The antenna gain is low and the antenna working environment is not ideal. even worse ,one of them is a handheld device...; Even so, they also can reach a satisfying communication distance (normally 300 meters, Max 480 meters in open space) on each one of three frequence bands(490M,868M,915M).parameters:490M (SF=12, Duty cycle=10%, PWR=16dBm,BW=125KHz) for CN866.5M (SF=9, Duty cycle=1%, PWR=13dBm,BW=125KHz) for EU924M (SF=12, Duty cycle=10%, PWR=12dBm,BW=125KHz) for JP924M (SF=12, Duty cycle=10%, PWR=14dBm,BW=500KHz) for USthe speed wont be fast, in fact very very low baud rate

author: ardf
author_rank: Contributor
timestamp: July 20, 2019, 10:34:14 am
content: I retrofitted two Chinese 430 MHz 30 dBm LoRa DTUs for an AX.25 radio link between my residence and a village house. The eyesight distance between the two is about 7 km NLOS. The path profile has two hills, while both locations are in valleys, so it's somewhat difficult for RF. The village house antenna is 10 dB DK7ZB, the residence antenna is vertical.I didn't measured the speed, because the only terminal access was needed, but it feels like 1 to 2 kbps may be.