Eventually, however, he was able to show that, theoretically, cables of sufficient purity, using fused silica glass, could transmit a signal with sufficient strength to be practical over any distance.

Such loss effectively robs power from the transmitter, requiring a stronger transmitter in order to transmit a signal of a given strength.

Angle modulation alters the instantaneous phase of the carrier wave to transmit a signal.

Special purpose radio time signal stations transmit a signal that allows automatic synchronization of clocks, and commercial broadcasters still include time signals in their programming.

Zone control uses a wireless transmitter to transmit a signal in a fixed area.