We have observed some strange behaviour of the SX1262 in SF10 LoRa mode (other SF’s work just fine).
Small packets up to ~80 bytes can be transmitted without any issues, but as soon as the packet size reaches ~90 bytes, virtually every packet arrives with a CRC error.
Interestingly, the CRC errors vanish (!) when reducing the TX power from +14dBm to e.g. +1dBm, which is counter-intuitive. We have tested on several radio frequencies and with various distances between receiver and transmitter from ~10m to 2km, always with the same result.
Our settings: bandwidth 0 (125kHz), code rate 1, preamble 10, +14dBm TX power, explicit mode, CRC enabled
Any idea what could be happening here?