Naxos radar detector

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Principal schematic of the Naxos ZM4 (FuMB28).

The FuG 350 Naxos radar detector was a World War II German counter measure to centimetric radar produced by a cavity magnetron.

Telefunken built a simple detector named "Naxos" that could pick up 10 cm / 3 GHz H2S radar transmissions, and a more sophisticated detector named "Korfu" with greater range and accuracy.

Korfu saw little use, but Naxos saw widespread service. There were two different types of Naxos. "Naxos Z" was developed for night fighters and mounted in a blister on top of the fighter's canopy. It could detect an RAF bomber from much longer range than FuG 227 Flensburg. Another version of Naxos, "Naxos U", was provided to U-boats to allow them to detect 10 cm / 3 GHz ASV, though by that time the U-boats were entirely on the defensive and it did them only a little good. By one of those weird coincidences which occur in wartime, the U-Boats received their Naxos 10 cm detectors on the same day that RAF Coastal Command deployed its first 3 cm ASV radar sets. Naxos was further hobbled by the fact that it proved very fragile in field conditions, and working out the bugs ended up being a difficult task.

The "Naxos ZR" was fitted to the tails of German night fighters to warn them if they were being tracked by RAF De Havilland Mosquito night intruders fitted with the AI Mk.IV radar and its derivatives.