hi guys i need to make a working radar i seen it done on a servo but cant remenber how to get the servo to go round and round lol any help guys would be great,thanks rye

Here you go, follow these directions. This will make the servo shaft spin clockwise, stop, or spin counter clockwise depending on the control input from that channel. That will let you switch the "radar" on or off (or change rotation direction) with a channel on your TX.

http://www.seattlerobotics.org/guide/servohack.html

Basically, you have to remove the mechanical stop on the servo gear and replace the pot with a fixed resistor on the PC board. The fixed resistor value will determine the stop/direction-change position on the TX channel.

If you don't want TX control, then you can probably do this mod, and then just connect the motor leads directly to power, instead of having it controlled by the amplifier on the PC board.