In a transmission node, a portion of the control information is separated into M parts of control information blocks having N bit length. According to the production method of the present invention, catalytic activity can be easily controlled, and a catalyst having high activity and high selectivity is obtained. All other receivers are prevented from monitoring that specific source for the duration of its activity, but continue to monitor the remaining sources. At the remote diagnostic site or medical processing center, the signal is then presented to a physician or other medical technician for analysis and diagnosis. The gearbox includes a many common components, selected irrespective of desired propeller direction, and a few unique components selected based on desired propeller direction.