"LoRa TX power drops when BLE is active on Heltec WiFi LoRa 32 V4.3 (KCT8103L PA/FEM conflict?)

#1

I apologize if this has been asked or answered before, i wasnt able to find it via searching

on the Heltec WiFi LoRa 32 V4.3 using the KCT8103L PA/FEM, i am unable to run BLE and LoRa simultaneously at full 27dBm Lora output power. BLE initialisation appears to interfere with the FEM/PA control — LoRa TX power drops when BLE stack is active. Can anyone confirm whether the KCT8103L control GPIOs are shared with the WiFi/BLE RF switch, and whether there is a way to configure the RF coexistence to allow BLE and LoRa SX1262 to operate simultaneously without PA power reduction? I am using RadioLib / LoRaWan_APP with BLEDevice init.

#2

Have you considered the problem that LoRa at 27dBm draws way too much power, and BLE is also very power hungry?

#3

We measured Lora RSSI dropping to -116dBm (from -40dbm) with BLE active, whether that’s consistent with a supply sag versus a PA control issue, i’ll perhas check rail voltage under load if that’d help isolate it. i was running on bench supply (not a usb computer lead) ?? worth double checking i guess, thanks