Sender Zehlendorf
The station Zehlendorf is a transmitter of Media Broadcast GmbH in Zehlendorf, a suburb of Oranienburg, and is located in close to 35 km as the crow line distance north of Berlin. His long-wave transmitter is one of the most powerful of its kind in Europe.
History
Zehlendorf is since 1936 location of transmission facilities. At that time, a short-wave transmitter for the fixed service was built for the 1936 Summer Olympic Games in Zehlendorf. This plant, which was referred to the end of the Second World War as a " radio spot Rehmate " had 26 different antennas. 1945 was the radio end point Rehmate of the Soviet occupying power as reparation - up to three antenna support made of wood - dismounted. Two of the not to be dismantled antenna support provided the building material for the 100 meter high radio tower radio station in Golm Golm, which was built in 1948 and demolished in 1979.
In 1952 it was decided to build the central longwave transmitter of the GDR at the site of the former radio end point Rehmate. The commissioning of the station took place in 1955. Between 1956 and 1958, a triangular patch antenna was installed at three 150 -meter-high, insulated against ground and guyed lattice steel masts.
A second transmitting antenna, which should be the actual operating antenna was built from 1960 to 1962. It consisted of a 351 meter high guyed, grounded steel lattice mast to which a cone-shaped cage antenna was attached. The 351 -meter high mast support was between 1962 and 1964 the tallest building in Europe.
With this antenna, an operating connection with the desired output power of 750 kilowatts in the long wave range of a frequency was possible was gradually reduced over time to reduce the interference noise from 185 kHz to 177 kHz. At least in 1959, was still sent to 185 kHz and from 15 December 1980 to 179 kHz. The maximum transmit power that is possible on the triangular patch antenna, is 500 kilowatts.
On May 18, 1978 collapsed the main mast end, after a Soviet aircraft MiG -21 collided with him. When the cause of the collapse, it was clear the Soviet Union promised to deliver a new mast and rebuild it. In order not to delay progress of the construction work by the stricter DDR German safety regulations, the area within a radius of 300 meters was declared around the mast to the Soviet enclave for the duration of the construction work.
In August 1979, the new tower was completed with a height of 359.7 meters and was taken on October 7, 1979 again.
In 1990 the plant was taken over by the German Federal Post Office. First, the transmission system should be shut down, because it was the cage antenna dismantled at 359.7 meters tall main mast and temporarily reduces the transmitting power of the long wave transmitter at 100 kilowatts.
In the second half of the 1990s began a rethink. The long-wave transmitter was modernized and the main antenna mast got a new cage antenna. In 1999, a fully transistorized longwave transmitter of Trans radio systems Berlin was taken with 500 kW output power in operation.
In 2000, a 129 meter high guyed, grounded steel lattice mast was built with a cage antenna for medium wave. He took over the function of the former station Berlin -Köpenick and served along with the dissemination of the program of mega radio for broadcast of programs of the Voice of Russia, partly in simulcast mode.
The long-wave transmitter was converted as the first major German TV channels on DRM operation on 29 August 2005. He sent intermittently at night three hours a day in DRM mode, the remaining time in the analog amplitude modulation.
From the main antenna mast and five FM programs are broadcast.
On 19 and 20 March 2007, the three 150 m high steel framework masts of the triangular patch antenna, which was no longer in operation since 2003, have been demolished.
The long-wave transmitter radiates currently the 24 - hour program of Germany radio culture on the frequency 177 kHz with a transmitter power of 500 kW of ( as of 2012). Daily four times a shipping forecast is displayed in the running program ( at 1.05, 6.40, 11.05 and 21.05 local time clock, to the last time but only during the summer time).
The end of 2014 also follows the Germany radio that needs to adjust its medium and long wave broadcasts a demand from the KEF at the earliest opportunity.
Frequencies and programs
Analogue radio (FM )
The transmitter emits Zehlendorf addition to the long and medium wave from even FM programs. The FM antennas are mounted on the 359.7 -meter long wave transmitter masts.
Analogue radio (MW)
This program is broadcast on medium wave 129 meters high masts:
By 2007, was sent to 603 kHz with 50 kW, after conversion to 693 kHz, a new 250kW transmitter TRAM 200S TRANSRADIO Berlin was put into operation. The broadcast of the Voice of Russia was set after heavy budget cuts on January 1, 2014. The medium-wave transmitter Zehlendorf is decommissioned in 2014.
Analogue radio (LW)
The long wave is radiated from the 359.7 meter high masts:
Compared to transfer to other distribution channels (FM, DAB) the delay of the transmission signal from Germany radio culture via the transmitter in a Zehlendorf in Berlin carried out in November 2013 test was the lowest.