Signalling information is conveyed from a transmitting device to a receiving device in a cellular radio network where user data transmission takes place on a traffic channel in discrete transmission bursts consisting of consecutive symbols. The double slug tuner principle is based on the movement of two line segments of different characteristics of 50 O inside a closed cylinder on either side of standard connectors. A forward end of the control input shaft is configurable to impart yaw control input or steering control input, or both, to one or more rotation transmission means coupled with yaw control linkage or steering control linkage, or both. A fully integrated embodiment achieves continuous input steering by moving a carrier domain along a continuous attenuator.