A driver capable of launching signals into a transmission line and of terminating signals at a receiver end of the transmission line includes within the driver a circuit for controlling the output impedance and a circuit for controlling the output slew rate. In the section plane containing the axis of the turbomachine and passing via the center of one of said injection orifices, the curvilinear abscissa distance along a flow line between the middle of the flow path at the trailing edges of the flow-straightening vanes and said center is greater than or equal to three times the height of said flow path. The stage mover assembly moves the stage along an X axis and along a Y axis relative to the stage base. The retaining portion is retained and received in the slot.