A radar receiver can detect another ship's transmissions at a greater distance than the transmitting set can obtain a usable reflected return. The explanation distinguishes a signal travelling directly to an interceptor from one that must reach a target and return to its source. Early operators also had to interpret uncertain contacts and interference without modern computerized signal analysis. Scharnhorst illustrates the consequences of damage to the detection system: the account describes a cable to her warning receivers being broken during the earlier cruiser action, while British ships continued tracking her. Smaller shells could therefore disable exposed equipment even when they could not sink the ship directly. Infrared search offers another way to look for targets without broadcasting a radar signal, though passive systems also have tracking limits and remain vulnerable to countermeasures.
Notable Point · 30:06-33:57
Radar emissions, damaged receivers, and Scharnhorst
Radar transmissions can disclose a ship before its own set finds the opponent, while Scharnhorst shows how damage to exposed receivers can further distort the detection picture.