Xact Communication XTR1 SIRIUS Radio Receiver "stop high pitched" Questions

...high pitched noise that changes with RPM. Troubleshooting: 1. The noise is still there if I unplug the antenna with the unit on. (excludes the antenna) 2. The noise stops if I turn the unit off ...

...high pitched beep the radio started playing again. I then remembered that one of the last things I input with the remote before the radio stopped working properly was mistakenly selecting an unwanted ...