Sender Donebach
The transmitter Donebach is a long wave transmitter of Media Broadcast GmbH in Donebach, a district of Mudau in the Neckar -Odenwald -Kreis. He has broadcast the Germany radio on the frequency of 153 kHz with a transmitter power of 500 kW during the day and 250 kW at night.
History
When the Germany radio on 1 January 1962 went on the air, there were only two transmitters to broadcast the program. This was in addition to a newly built medium-wave transmitter in Mainflingen to the long-wave transmitters in the previous program German long wave transmitter in Hamburg- Bill Werder, who belonged to the NDR. By the end of 1962, the German Federal Post Office, which was responsible for the transmission mode of the Germany radio also build a long-wave transmitter in Mainflingen. Has been sent to be on the 151 kHz frequency at the lower end of the long-wave band. However, the long-wave transmitter in Mainflingen represented only a temporary, while looking for a suitable transmitter site.
This was the Federal Post Office on a plateau at Donebach in the Odenwald. The former airfield is located 500 m above sea level. NN was considered to be ideal in order to provide fully from there the FRG and the GDR can. The transmission system was built from 1965 to 1967 on the site. On March 10, 1967, the station took on the frequency 151 kHz operation. The antenna then served an omnidirectional antenna of four 200 meter high towers, which were connected to each other via strained between the mast tops ropes. Of these four poles located in the center of the mast with the transmission energy has been supplied.
However, these very effective transmitting antenna led to disturbances in the reception of the on 155 kHz transmitter Brasov in Romania, and so no operation was possible with the desired transmission power of 250 kW, but only with 70 kW. But even with this transmission power could not be avoided co-channel interference, which is why in 1972, the transmitter was rebuilt in a directional antenna with a fade out towards Braşov. For this purpose, two masts were broken down and the two remaining masts equipped with an umbrella-like roof capacity of copper hollow parts. With this arrangement, operating at 250 kW output power possible.
In Geneva wave plan in 1975 the transmitter Donebach the frequency has been officially assigned 153 kHz. At the same time new performance limits have been set. During the day, was to be sent with 500 kW and 250 kW of power at night, with daytime and low at night carried a strong suppression in the direction of Romania had. For this reason, in 1982 two new transmitters for 250 kW output power were installed with pulse duration modulation, the work much more efficiently than the transmission equipment used to date. In addition, both antenna masts were up from 200 meters to 363 meters. For this purpose the poles have been removed and then re- established using new elements, where the old elements form the upper portions of the masts.
The increase of the two radiating transmitting masts of Radio Donebach with a height of 363 meters were the tallest buildings in the Federal Republic. Since reunification, they occupy after the Berlin Television Tower with 368 meters height the second place. They are like the two towers of similar executed investment in Aholming grounded constructions, in which the radiated RF energy is fed into about 300 meters altitude above the lashings.
The remarkable thing about the system is that the carrier frequency of the transmitter is derived from a rubidium atomic clock, which is located in the station building. It is thus, as the carrier frequency of DCF77, a calibration frequency.
Range
The transmitter Donebach supplied Germany coincides almost exactly with the exception of eastern Bavaria. In addition, he is to receive in Switzerland, in northeastern France, Luxembourg, Belgium, the Netherlands and large parts of the UK. The reception problems in eastern Bavaria resulting from the necessary power reduction in southeast direction, to prevent interference with working on the same frequency transmitter Brasov in Romania. In Bavaria was therefore taken in 1979 with the transmitter Erching an additional long-wave transmitter for the radio in operation Germany, which was replaced in 1989 by the transmitter Aholming.
Location
Geographical coordinates of the two poles:
- 49 ° 33 ' 40 "N, 9 ° 10' 23" O49.5611666666679.1729722222222 ( radio mast )
- 49 ° 33 ' 34 "N, 9 ° 10' 51" O49.5593055555569.18075 ( reflector mast )
Others
In Mudauer district travel Bach the German Telekom operates the telecommunications tower travel Bach ( with FM Transmitter ).