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In course of the workout of the [[waveplan of Geneva]], the facility lost the exclusive frequency of 1586 kHz and the transmitter was retuned to 1593 kHz. Because this frequency is used by other broadcasters, [[interference]] problems occurred at nighttime in spite of the 800 kW transmitting power. As compensation, station owner WDF was allotted a second medium wave frequency of 720 kHz for daytime transmission only. Between 1988 and 1990, the 95-meter mediumwave mast and the 210-metre TV- and FM-mast were replaced by a 301 meter high guyed steel-framework grounded radio mast with a [[cage aerial]] for mediumwave in its lower sections. In 1993, the 1593 kHz mediumwave transmitter was shut down because some components had been manufactured with [[PCB]]s. 720 kHz remained in service, but it was not allowed to use this frequency for night transmission until new regulations were enacted in 1995.
At these point there were two radio masts in Langenberg: the 160-metre radio mast for medium wave and the 301-metre radio mast for MW, FM and TV. The shorter mast had to be renovated in 1996; unfortunately, one auxiliary rope tore during this work and the mast collapsed on [[September 2]], [[1996]].
In 1995 the transmission power had to be reduced for ecological reasons. Until the early 1990s the whole radiated power in the AM range was 1000 kW (800 kW on 1593 kHz and 200 kW on 720 kHz), but after 1995 the transmitter was restricted to 85 kW. After the collapse of the 160 metre mast, radiation power of the AM transmitter was reduced to 20 kW.
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* http://de.wikipedia.org/wiki/Rundfunksender_Langenberg
{{coor title dms|51|21|19|N|7|08|08|E|region:DE-NW_type:landmark}}
[[Category:Broadcast engineering]]
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