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FuSan Dora

Large radio guidance site for Luftwaffe fighters

FuSan Dora site overview

What to see

Located north east of Fecamp in the village of Saint-Martin-aux-Buneaux you can find a large Luftwaffe radio guidance site which was codenamed ‘Dora’, which once featured around 22 buildings spread throughout the village.
The most important of these were the five concrete bunkers which were built to support large antennas for the Y-Verfahren system. The antenna beamed a single radio signal to German fighters in the air to help them calculate the position of their aircraft in order to intercept Allied bombers.
This system was an upgrade of the X-Verfahren developed in the early 1930s but used a lower frequency and was created for improved range and accuracy. It was accurate to around 250km distance and there were six sites built to give the system wide coverage of the occupied areas of Northern France.
The Dora Y-Station site featured five ‘Sendstations’ for broadcasting the signal and up to five fighters could be kept in contact with at any one time. These Y-receiver equipped aircraft would be part of a larger formation, passing on the target information to the rest of the group.
It was mainly used for directing groups of fighters during the day but could also be used by single night fighters.
Like many of the German technological radio and radar advances however it was quickly rendered obsolete by Allied counter measures.
Today only two of the five antenna buildings can be easily visited but you can see many of Dora’s supporting structures including generator buildings, anti-aircraft positions, ammo storage bunkers, and small shelters.
Most of the site is on private farmland or in gardens and so permission must be sought before visiting the bunkers.

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