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The Sender Donebach (Transmitter Donebach) is a 500 Kilowatt longwave transmitter working on 153 kHz, which transmits the program of "Deutschlandfunk".
This radio facility, which is property of the German Telecom Inc. was built between 1965 and 1967 on a former airfield and wnt on March 10th, 1967 into service. As aerial was used in those days an omnidirectional aerial consisting of four 200 metre high radio masts, which were connected via wires on their tops.
From these masts the mast in the middle was fed via radio power.
This very efficient transmission aerial led to interferences of the Romain transmitter Braşov, working on the same frequency and so only a power of 70 kilowatts instead of 250 kilowatts was possible.
But even with these reduced power jammings of Brasov occurred, so 1972 the radio facility Donebach was rebuilt as a directional aerial with a minimum toward Brasov. Therefore two radio masts were demounted and the two others were rebuilt as umbrella aerials. Now a transmission power of 250 kilowatts was possible.
The Waveplan of Geneva in 1975 set now power limits to the transmitter Donebach and now there was a daytime operation with 500 kilowatts and a nighttime operation with 250 kilowatts allowed with a power minimum toward Brasov. This minimum must be weak at daytime and strong at nighttime.
Therefore in 1982 two new transmission devices with a power of 250 kilowatts were installed. These devices use a PDM-modulator allowing transmitting more ecconimaccally.
At he same time the aerial masts were rebuilt. The old masts were replaced by two 363 metre high grounded masts, in which the radio power is fed via the guyes. The upper sections of these masts consist of the older masts.
The radio masts of onebach are the second tallest construction in Germany (only the TV Tower Berlin is with a height of 368 metres a bit higher).
Both radio masts are, as the similiar built 265 metre high radio masts of Aholming, grounded, in which the radio power is fed over the guys in a height of 300 metres.
Remarkable at this facility is, that the frequency of the carrier is derived from a rubidium atomic clock, which is in the sation building. It is as the carrier frequency of DCF77 a standard frequency.
Geographical coordinates of the masts
- 49° 33'36" N, 9° 10' 55" E
- 49° 33'43" N, 9° 10' 28" E
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