weather radar not working

Try to change the weather through the file. Settings-Weather-Weather File.

1. What simulator do you use?
2. Does FSRealWX connect to the simulator?
3. The simulator itself is configured to get the weather from a file, according to the instructions for the program?
I will explain that if the weather is transmitted via a file, then FSRealWX itself does not participate in the weather implementation, it forms a weather file, it is read by the simulator and everything, then only the simulator and the weather radar work.

If you have FSX, then you need to configure direct mode, the weather transmission via a file in FSX works, but it is not suitable for flights at high altitudes. Unfortunately, I don't have PMDG, I can't help with the setup, but in the new beta, which is currently being tested, there is data export to PMDG, perhaps when it comes out you will get the desired result.