Hello, I’m very new to LoRa but have a basic program with mkr ENV sending temperatures and humidity to a second mkr1310
I am using the included antennas and set the spread to 12 and minimum bandwidth to try and maximize range.
I’m confused about the setting for maximum transmit power. I set it to 20 using the function in lora.h but there is also a PA boost. I’m not clear hot to turn on or set pa boost as all I can find is how to change the pa boost pin.
Can anyone offer some advice? I haven’t actually measured the current on tx but according to the data sheet max tx power the chip consumes around 120mA.
Picture of receiving module with OLED readout
You missunderstand.
The PA-Boost pin on the LoRa device is the one that is normally connected to the antenna and is the output used to produce the devices maximum rated power of 20dBm. You cannot increase the power output beyond 20dBm.
Where in the World are you ?
What LoRa settings are you using ?
I’m in the USA
Using 915Mhz, spread of 12, bandwidth 7.8k and 4/8 fec.
Thanks for clarification. It’s been about 10 years since I’ve done any real coding lol
For a 915Mhz LoRa device the lowest bandwidth you can reliably use is 62.5K. To use lower bandwidths you need a LoRa device with a TCXO for the crystal, not common for the SX127X LoRa devices.
SX126X LoRa devices nativly support the use of a TCXO and the devices can then be used down to a bandwith of 7.8K, even when there are significant temperature differences between the TX and RX modules.
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