LoRa is the radio modulation, the PHYsical part of the stack.
LoRaWAN is the MAC protocol, standardized by the LoRa Alliance to create a LPWAN.

You can look at the Microchip RN2483 as a LoRa modem, it has the LoRaWAN stack implemented for you. By connecting toits UART interface, you can implement in a matter of hours.

I have the same noise with one of my Omega modules, but is still in a working state..

The tone of the noise also changes a bit when to module is under load.

The other Omega I have, makes no noise at all.

BR
Sven

@Lazar-Demin , make sure to implement a LoRaWAN stack.