Actively Pointed Antenna


Up until now, while a rover was moving, it had to use an omni-directional antenna, one that broadcasts in all directions at once. But because it sends its power everywhere, it can't send it as far, and can only send a small amount of information.

Nomad uses a special directional antenna, that only broadcasts in one direction to help solve this problem. Since it only uses power to send in the direction it wants to, it can send information further. The directional antenna on Nomad uses a special compass and a global positioning system (GPS) to determine where it is and what direction it needs to broadcast to. As Nomad travels over bumps and rocks, it's antenna stays precisely pointed to the reciever. This allows for the stronger signal which is needed to transmit images from the panospheric camera.


Want to see how it works? Try it yourself...

First, cup your hands around your mouth and say your name. How does it sound?

Now, take your hands away from your mouth and say your name again. Did your voice sound different the second time?

When your hands were cupped around your mouth the sound you made was focused in the direction you were facing. When you took your hands away from your mouth, the sound spread out in all directions more quickly. So, with your hands cupped around your mouth, your voice will go farther and be louder.


The Actively Pointed Antenna...in Sports

Have you ever watched cheerleaders shout a cheer? Did they use anything to magnify their voices? If you watched carefully, you probably saw the cheerleaders use a megaphone. This cone shaped device works much like the actively pointed antenna, and helps the cheerleaders to be heard all the way in the back of the stands and across the football field or basketball court.
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Last Modified on: Fri Jun 13, 1997