Could American forces track a ship through that ship's own radar emissions?
Short answerYes, using a receiver tuned to the signal and directional bearings, though speed and accuracy are harder to achieve.
NotesAn active radar gives an opponent a signal that can be detected with a suitably tuned directional receiver. A bearing plot can then help locate its source. The principle is straightforward, while obtaining an accurate position quickly is more difficult. The technology is treated as a longer-term threat, with the qualification that the Japanese did not have it at the particular battle being discussed.