any ideas how i can built a remote controlled robot with a 4 channel radio gear equipped with a wireless video system?

 

You just need a standard 4 channel remote control system, the video system is completely independent, using a camera and video sender on the robot, and a receiver and monitor near the RC transmitter.

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PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

For the camera the best web site is http://www.superdroidrobots.com/sensors.htm

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Robotics is heaven in my book.