Yellow antenna can turn around two perpendicular axes. Only one motor (in grey) drives it. The mechanism is controlled by pink lever and violet sliding shifter.
The video shows:
1. Clutch (in blue transparent) moves to the right to connect transmission between red motor shaft and blue gear. The clutch has key sliding joint with the motor shaft.
2. Motor starts, red shaft rotates. Brown carrier gets motion through gear satellite drive (blue, orange and grey gears) and the antenna turns around longitudinal axis.
Green gear is not kept immobile so its turns together with yellow gear.
3. Motor stops when the antenna reaches needed position.
4. The clutch moves to the left to connect transmission between the motor shaft and green gear and to brake the brown carrier (red brake pad and green spring).
5. Motor starts, red shaft rotates. The antenna turns around traversal axis thanks to bevel gear drive.
6. Motor stops when the antenna reaches needed position.
7. The clutch moves to neutral position.
Advantage: motor is base grounded.
Disadvantage: the antenna can not turn around two axes at the same time.