It took me a while to figure out how transistors  work. Although the theory is quite simple, the application was  something else. The goal was simple: To use the RC transmitter Channel 5 switch to "switch" ON or OFF "Manual Mode" in the micro-controller. This will enable the ground station to override control of the UAV in any time of the mission flight. Again goal simple enough. The application in many respect was simple enough. what was needed was to understand the signal range of the the transmitter switch in order to raise or lower the base current of the transistor for signal input. The objective is to be able to switch between AutoPilot and Manual mode using a switch on the RC transmitter. Hope I get there!