Difference between revisions of "LoRa Questions"
From Wiki for Dragino Project
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Band3(LF): 137 ~175Mhz | Band3(LF): 137 ~175Mhz | ||
|433Mhz | |433Mhz | ||
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| + | |868Mhz | ||
| + | |Semtech SX1276 | ||
| + | |Band1(HF): 862 ~1020Mhz | ||
| + | |868Mhz | ||
| + | |- | ||
| + | |915Mhz | ||
| + | |Semtech SX1276 | ||
| + | |Band1(HF): 862 ~1020Mhz | ||
| + | |915Mhz | ||
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Revision as of 00:58, 25 April 2017
Contents
What is the frequency range of the Dragino LoRa products?
The Dragino LoRa products base on SX127x solution normally has three version: 433, 868 and 915. This means the device is best tuned at this frequency as show at below table:
| Version | LoRa IC | Support Frequency | Best Tune Frequency |
|---|---|---|---|
| 433Mhz | Semtech SX1278 | Band2(LF): 410 ~525Mhz
Band3(LF): 137 ~175Mhz |
433Mhz |
| 868Mhz | Semtech SX1276 | Band1(HF): 862 ~1020Mhz | 868Mhz |
| 915Mhz | Semtech SX1276 | Band1(HF): 862 ~1020Mhz | 915Mhz |
How can i increase the distance for two LoRa devices?
Check the use environment
First , User should notice: Radio link quality and performances are highly dependent of environment.
Better performances can be reached with:
- Outdoor environment.
- No obstacles.
- No high level radio interfere in the ISM band you use.
- At least 1 meter above the ground.
Radio performances are degraded with:
- Obstacles: buildings, trees...
- Inner buildings environments.
- High ISM band usage by other technologies.
- Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small.
Check the Antenna
- Check if the Antenna has a good connection to the Antenna connector
- Check if the Antenna has the good performance in the require frequency. (need special device, so may not possible to check in most case.)
Check the Frequency Setting in Software
- Check if in the software, the correct frequency is set.
Check the Modem Setting in Software
Check if the modem is set to the correct modulation, Different modem setting will affect heavily in the distance and datarate. User can refer this document to see how it works.
To configure modem setting in RadioHead Library, use can consult below place in the software:
- RH_RF95::ModemConfig in RH_RF95.CPP
- setModemConfig in RH_RF95.CPP
