Also, you might want to flip the breaker and see if both are on the same circuit. That can cause problems. My computer responds nastily if I get the cell phone near it. It has to do with the speakers. When I turn off the speakers, it goes away. Might try that - turning the volume down doesn’t work.
I fear the radio and computer are on the same circuit.
No, I can’t change them and am at the limit of how to plug into these old wires in an old mobile.
Thanks for the information, you are more than likely correct.