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Decca Station Zeven
The DECCA Navigator system was an electronic navigation aid for coastal waters. It operated as a continuous wave phase comparison system in the frequency range 70 - 130 kHz. Station Zeven in North Germany, between Bremen and Hamburg, was part of the Frisian chain. The other three stations in this chain were located in the Netherlands and in Denmark. It was decommissioned in December 1999; the photos on this page were taken one year later. The facilities in Zeven will not be dismantled completely, but a Differential GPS beacon will be installed in 2002. The frequency will be 303.5 kHz.
The two transmitting antennas for 71.43 kHz and 128.58 kHz. Radiated power was about 100 Watts.
The feed line is carried through the window in the "tuning house". A spark gap and parts of the matching coil can be seen inside.
Mast insulator.
The station building has been given up already years before the DECCA system was shut down. It is now used by a pony club. Two wooden masts beside the house are still carrying wire antennas. They were probably used for monitoring purposes.
One of the trail marking plates shows an insulator.
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Last update 30/7/2006