Richtfunkstelle Berlin-Frohnau
The radio relay system Berlin- Frohnau with its 117.5 meter high transmission tower is located in the north of Berlin, in the district of Frohnau. Owners and operators of radio relay system was the German radio tower GmbH ( DFMG ), a subsidiary of Deutsche Telekom, based in Münster. The plant is used today mainly for the mobile. Neither the large nor the small tower ever television or FM radio programs were sent.
Transmission Tower
The radio relay system Berlin- Frohnau consisted of a 117.5 -meter-high free-standing steel framework tower which was built in 1971-1972 for 2.5 million marks. The tower had a weight of 400 tonnes and its foundations were built on the four pillars 100 m³ each concrete.
Transmission tower
Construction work on the 358.6 -meter-high radio mast began on March 16, 1977 On May 30, 1978, the topping-out ceremony was held. ; was put into operation the mast on 16 May 1980. Its construction cost of 11.5 million marks. It allowed until German reunification across a radio link between West Berlin and the old Federal Republic of Germany on the territory of the GDR, with the far end of the radio link of the transmission tower Gartow 2 near the Lower Saxony Gartow on the Höhbeck was. The straight line between Berlin- Frohnau and Gartow is around 133 km. The height of the tower resulted from the need to overcome the curvature of the earth.
The ten radio frequency pairs in the range 5-8 GHz were able to transfer up to 11,700 simultaneous calls. The weight of the mast was 920 tons, the weight of the total of 3.8 kilometers of guy ropes was 250 tons. In the tower there was an elevator that went up to a height of 325 meters. At the base of the tower had a dimension of 4.3 meters × 4.3 meters. In the foundations of a total of 2000 cubic meters of concrete were used.
The transmission tower was after the TV tower, the second tallest structure in Berlin, and the fourth highest in Germany. He had near the tip of a 4 meter x 5 meter operating room for the radio equipment. This space was with the room where the largely identical, but smaller Sendemastes Gartow 2 the highest altitude above the ground closed space of all buildings in the EU. He was served by an elevator that took eight minutes for the journey.
The eavesdropping that had been expected from the plant, later turned out to be an illusion. Prior to commissioning of this plant a connection was only possible with the help of the disturbance-sensitive technique of horizon radio relay, as it was used in the lower transmission tower. After the reunification of the radio links were decommissioned and dismantled the dish. However, out in the first half of the 1990s nor a use of the large mast for the radio of the Bundeswehr.
Since the receipt of the tower caused high maintenance costs and were no longer of use, the owner applied for a demolition permit in 2008. On 8 February 2009, the tower was blown up.
Bursting Sendemastes, 2009
AM antenna
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During the IFA 2001 found in Frohnau trial broadcasts in DRM mode on the medium wave frequency 1485 kHz instead. Since none of the two antenna carrier was designed in Frohnau for the radiation of medium wave, were erected for this purpose a long wire antenna in a ten- meter pole. The programs were conducted in simulcast with Schäferberg and Ruedersdorf.