For radar detector warning ranges -
here is a post about them
Quote:
The Scharnhorst also had a trainable Palau passive antenna on top of the aft rangefinder/radar hut. This was a passive detector antenna that feed intercepted signals to the Wanze automatic radar warning receiver (70cm-350cm wavelengths) and the Samos or Fanoe detector recievers. The Fanoe could automatically detect wave lengths from 20cm to 70cm.
The Bali omni-directional detector antennas would have been mounted high up on a mast or yard arm and still functional. These could have detected metric emissions at great range. Next the Sumatra antennas placed at sundry places about the superstructures could give a rough indication of direction of metric emissions.
The Scharnhorst's FuMB devices had also detected Burnette's cruiser's radar emissions early that morning, long before the Belfast detected the Scharnhorst with its Type 273 at 30km. This was the reason Bey turned around to investigate, but he failed to switch on his active radars at that point, and obviously did not have them switched on in time
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So it look like the detectors had a longer range than the actual radar
