Video: HSI to RMI connection, with course knob adjustment
Video: HSI course input connected to synchro transmitter (Course pointer)
The videos show that when an iput from a synchro transmitter is connected to the Course input then the Course knob ceases to work as before when no Course synchro is attached.
I dont really understand if this is correct or if the input is meant to be used like this.
For connections see here.