OTAA join failed for SF10

End Devices (Nodes) LMIC
1

Hi guys,
I’m testing the effect of spreading factor on the range coverage. I’m using the repo from https://github.com/matthijskooijman/arduino-lmic with OTAA connection and single frequency of 923.3MHz. What I have done was changing the data rate in lmic.c -> initJoinLoop -> setDrJoin(DRCHG_SET, DR_SF10);
It works perfectly fine for SF7,SF8 and SF9 but for SF10, the join request is not successful.
image

For SF9, the request join instantly.
image

I have tried many other ways suggested in the forum like
LMIC_setDrTxpow(DR_SF10,14);
LMIC_setAdrMode(1);
but it does not work for me. Anyone has any idea on how to solve this?
I’m using LoRa gateway LG01 and 915MHz LoRa shield with SX1276 chips by Semtech

2

I’m sorry, that is a single-channel forwarder and not a proper LoRaWAN gateway. You should not use that on TTN (so please disconnect it), and questions about that are off topic here.