saved from http://longwave.bei.t-online.de - all
rights acknowledged
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.
The German staff of the Zeven station
taken in the mid-1950s.
The transmitter can be seen in the background.
(Photo courtesy of Terry Hughes GM4DSO)
Return
to the Other Decca Stations Page
Last update 18/08/2014