1.   Although buying these systems in Canada is technically not illegal, it is illegal for American companies to broadcast their signals in Canada.

2.   And some stations broadcasting digital signals do not yet offer any high-definition shows.

3.   Because it is not perfectly stationary in the sky, the satellite cannot be used for certain jobs, such as directly broadcasting television signals to small home dishes.

4.   Boeing also may get involved in in-flight entertainment, Clarkson said, using new communications technologies to broadcast television signals into screens on the back of seats.

5.   A student would be interviewed sitting in front of a television camera and the signal would be broadcast to another location via high-speed telephone line or even satellite.

6.   ABC, CBS, FOX, NBC and PBS all broadcast digital signals, which carry much more information than analog broadcasts.

7.   But the biggest and most disruptive controversy is a growing debate over the adequacy of the transmission format for broadcasting digital signals.

8.   For example, hundreds or thousands of sensors could be embedded at load-bearing and other critical points inside an airplane and could continually broadcast diagnostic signals.

9.   From time to time they also broadcast special signals, called electronic countermeasures, that disable illegitimate access cards.

10.   GPS satellites broadcast two signals.