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Old October 21st, 2005, 08:37 PM   #1
Obelixx
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Join Date: Apr 2005
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History of Radio Tower Ismaning, the Bavarian Eiffel Tower


The Radio Tower Ismaning, nicknamed Bavarian Eiffel Tower was a 163 metre tall radio tower built of wood at Ismaning, Germany ( http://en.structurae.de/structures/d...fm?ID=s0010728 )


History

*1932: Construction of two 115 meters high wood towers as support towers for a t-antenna for a transmitting antenna for medium wave (frequency: 563kHz).

*1934: Dismantling of the two wood towers. One of the towers is rebuilt in Nuernberg, where it stood until 1969. The second tower was established on a 39 meters high substructure of Pitchpine wood in Ismaning (these construction work was done by the Karl Kuebler AG, Stuttgart). It carries from this time a dipole antenna for medium wave broadcast (transmisssion frequency: 740kHz). This antenna was fastened on 7 meters high arms on the tower, which was after its rebuilt, 156 meters tall. The feed of the high frequency into the dipole takes place in 120 meters height. There was a small housing, in which the feed was installed. In 80 meters height the lowest end of the dipole half was fixed to the tower. In this height in a little housing there was a differential antiresonant circuit, so that the transmitting energy cannot flow off over the feeder. The wires of the dipole antenna were hollow ropes with 15,5mm diameter with a core of hemp and were fixed at 1 meter long arms at the east and west side of the tower.

*1951: Frequency conversion to 800kHz. The antenna at the wood tower may in order to avoid interferences of other radio stations only be used at daytime.

*1966: Assembly of transmitting antennas for FM-broadcasting in form of two fields of four dipoles in a height of 80 meters.

*March 3rd, 1966: Shutdown of the medium wave transmitting antenna, reduction of the tower height to 156 meters after disassembly of the upper arms.

*November 28th, 1966: Inaugauration of the antennas for FM-broadcasting at the wood tower.

*January 13th, 1967:Inaugauration of further antennas for FM-broadcasting in a height of 80 meters.

*February 16th, 1967: Inaugauration of antennas for FM-broadcasting in a height of 40 meters.

*July 5th, 1977: Shutdown of FM-antennas on the tower

*March 16th, 1983: The tower is demolished by using explosives, because of its bad structural state

Nowadays the housing, which stood under the tower and the four concrete basements of the legs still exist.
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