Bornholm is situated between Sweden, Germany and Poland, and all traffic between Russias baltic ports and the rest of the world must pass the island.
Therefore the Germans had placed a radar, two submarine listening posts and began the construction of 4 large cannon bunkers on the small island.
The type of radar was called a FuMG404 Jagdschloss panorama radar.
The radar antenna was 24 meters wide and 5 meters tall (12m with the building itself), and weighed between 25 and 30 ton.
It was rotated at 10 RPM.
Planes could be detected up to 80-200 km away, (depending on the targets flight altitude) at a 300 meter resolution.
It had the following specifications:
- 7° Horizontational angle
- 60° Vertical angle
- 158-240 MHz Frequency
- 150kW pulse power
- 2 Microsecond pulse
- 128 element array antenna
- 75kW Antenna rotor