For testing receivers that will use the new Galileo (satellite navigation) there is no alternative, as the real signals do not yet exist.

Once the Fed quit raising interest rates, that was a real signal we'll work our way through it.

But while the record is a good one, it can be hard to tell the real signals from the false ones.

But real signals are rarely so private.

However, in practice, this cannot be achieved, as real signals are always time-limited.

No one has the slightest idea if there is a real signal buried away in there.

"It does not send a real positive signal to other businesses that we might try to attract," he said.

However, all real signals contain a certain amount of noise.

"I'm getting some real mixed and bad signals here," Bolan said.

That is the real signal that must be sent out.