Transmission systems in Mainflingen
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Transmission systems in Mainflingen
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| Basic data | ||||
| Place: | Mainhausen | |||
| Country: | Hesse | |||
| Country: | Germany | |||
| Altitude : | 113 m above sea level NHN | |||
| Coordinates: 50 ° 0 ′ 56 ″ N , 9 ° 0 ′ 39 ″ E | ||||
| Use: | Radio transmitter , time signal transmitter | |||
| Accessibility: | Transmission system not accessible to the public | |||
| Owner : | Media broadcast | |||
| Data on the transmission system | ||||
| Number of towers / masts: | 18th | |||
| Construction time: | 1959 | |||
| Operating time: | since January 1, 1959 | |||
| Wavebands : | LW stations , MW stations | |||
| Radio : | LW broadcast , MW broadcast | |||
| Position map | ||||
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There are two large transmission systems for long and medium wave near the Hessian town of Mainflingen in the municipality of Mainhausen ( Offenbach district ) . They are used for civil long-wave radio and here in particular for the dissemination of the DCF77 time signal . With its range of over 2000 km, the transmitter covers all of Central Europe and controls an estimated 100 million radio clocks . The channels have been operated by the private company Media Broadcast (formerly T-Systems ) since 2007 .
Long wave transmission system
The long wave transmitter located on a fully enclosed area, consists of twelve to earth insulated steel truss masts with heights from 100 to 220 meters, where T and triangular patch antennas are attached. They are used by long wave transmitters whose callsigns begin with DCF .
The best known of these transmitters is DCF77 for the transmission of time signals on the carrier frequency 77.5 kHz. This time signal is generated by an atomic clock and controlled by the Physikalisch-Technische Bundesanstalt . The broadcast of time pulses began on January 1, 1959, initially only in the morning. In August 1970, the system switched to 24-hour continuous operation. The signals correspond to the international time system UTC . The time information distributed via DCF77 represents the legal time in Germany .
DCF49 , the signal of the European radio ripple control EFR, also sends there . Until 2005, DCF42 was also sent, a DGPS signal .
In addition to the transmitter building, there is also a cell phone tower made of precast concrete .
To the south of the main system, outside of the company premises, but still north of the A 3, there is another transmission antenna for long waves in the form of a T antenna suspended from two guyed steel truss masts . It was built on a clearing in the forest, on which the Schloss houses an older castle or desert.
Until 1982 the system also served as a long-wave radio transmitter, in particular as a reserve transmitter for the Donebach transmitter on the long-wave frequency of 153 kHz. For this purpose, a 142-meter-high guyed steel truss mast, insulated from earth, with a trap antenna with a maximum diameter of 64 meters was used. This device including the mast was taken out of service and dismantled in 1982.
location
- Coordinates : 50 ° 0 ′ 56.5 ″ N , 9 ° 0 ′ 42.6 ″ E main facility
- Coordinates : 50 ° 0 '27 " N , 9 ° 0' 58.2" O Südanlage
Medium wave transmission system
The Mainflingen medium wave transmitter was built in 1966. It is also known as Mainflingen B and, in contrast to the long-wave transmitter, is located south of the A3. A 95 meter high steel truss mast , insulated from the ground, is used as the antenna .
Until 1978, Mainflingen was also the reserve location for all medium wave frequencies of the Deutschlandfunk on the frequency 1,539 kHz. For this purpose, there was a 144-meter-high steel lattice mast, insulated from the ground, with a trap antenna . Until 1983 there was still a crossed dipole antenna , which was attached at a height of 75 meters to five 88-meter-high steel framework masts insulated from the ground. On January 1, 1995, the broadcast of Deutschlandfunk via the Mainflingen transmitter was given up because the antenna was poorly efficient and the Heusweiler transmitter could be won as a replacement. Until 1983, a dipole antenna suspended from two 85-meter-high masts at a height of 75 meters was used during the night to broadcast the medium-wave program of Deutschlandfunk . It is dismantled today.
Originally the facility was supposed to be demolished, but from July 1, 1997, Evangeliums-Rundfunk was found as a new tenant. In 2005, this initiated the construction of a new crossed dipole antenna for 2.4 million euros, which will be used from April 1, 2006 for remote reception in the morning and evening. It consists of five 80-meter-high steel framework masts, which carry the cross dipole radiating diagonally into the ionosphere . The central mast is earthed and the four edge masts are isolated from earth. This cross-dipole antenna is the only broadcast antenna in Germany that broadcasts circularly polarized radio waves and, along with the cross-dipole antenna of the former RIAS transmitter in Berlin-Britz, which was shut down in July 1995 and has since been dismantled, the only one of its kind in Germany.
The medium wave transmitter was switched off on December 31, 2011 for cost reasons by the ERF. On March 5, 2012 it was announced that the last potential new tenant had jumped off and the facility was now being demolished.
location
history
The radio transmission system began its work on October 1, 1949 with a modern mobile transmission system that worked until the following year, until the large transmission masts and structures required for actual operation were erected. Since November 22, 2006, the DCF77 transmitter and HBG have been transmitting both disaster reports and weather data. Correspondingly equipped radio clocks are able to display a four-day weather forecast for 60 regions in Europe . Until 2007, the transmission systems belonged to the Deutsche Telekom subsidiary T-Systems , from which the former subsidiary Media Broadcast, which has belonged to the French network operator TDF since January 2008 , was separated. The area has been a legally valid FFH area since 2008 , on whose area the rare sandy grassland grows. The area is looked after by a shepherd who lets his flock of sheep graze the lawn once a year.
See also
- List of transmitters in Hessen
- List of the television towers and transmission systems of Deutsche Telekom
Web links
- Trap mast Mainflingen. In: Structurae
- Mainflingen medium wave dipole aerial masts. In: Structurae
- Medium wave transmission mast Mainflingen. In: Structurae
- MW-Kreuzdipol Mainflingen , published at www.waniewski.de
Individual evidence
- ↑ http://www.radioeins.de/programm/sendung/medienmagazin/radio_news/beitraege/2012/sender_mainflingen.html ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
