I purchased a couple of the wiscore 11310 to send temperature data over lora to another device I made into a gateway which happens to be another 11310.
I used micropython to try out sending lora payloads but I noticed a quiet, high pitched sound coming from my board during transmission, which does not happen on my esp32 heltec lora board with the same sx126x chip.
The high freq sound could be from some harmonic frequencies in the board that is in audible range. Can you share me the firmware file? Maybe UF2 so I can validate it on my RAK11310 module…
What is the WisBlock Base Board you are using? Is it a RAK5005-O or the newer RAK19007/RAK19003/RAK19010 versions?
On the RAK5005-O there was an audible sound from the DC/DC converter when drawing higher current. This usually happened when sending large data with the maximum transmit power over LoRaWAN.