DRMradio

 

 

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Links.

RTL’s Marnach site (north Luxembourg) has recently installed two new solid state transmitters from Telefunken Sendersysteme Berlin, each transmitter is capable of 120 kW DRM or 300 kW AM on 1440 kHz. The old 600 kW Telefunken Pantel transmitters are not DRM capable, although in AM the output of the two new transmitters can be combined with one of the old transmitters (PWM modulator) for a total of 1200 kW AM output power.

 

 

Telefunken DRM exciter.

 

Two Telefunken DRM transmitters.

 

During the day both transmitters are used to provide 240 kW DRM feeding the directional antenna beaming 45° towards the Köln/Düsseldorf area. The antenna system consists of 3 guyed phased array, each 1/2 wavelength high, with 1 radiator and 2 passive reflectors.

 

At night time only one transmitter is used feeding 120 kW (DRM) or 300 kW (AM) to the antenna. This antenna consist of a 1/4 wavelength omni-directional radiator with a single passive reflector.

 

In the old days of Radio Luxembourg it was used mainly for broadcasts to the UK, so the pattern has a slight gain towards the north-west and some attenuation towards Frankfurt/Munich. It also has a higher take-off angle to reduce the fading zone caused by the simultaneous reception of ground wave and sky wave (AM).

 

[thanks to Michel Asorne at BCE and Telefunken for the photos]

 

 

Marnach transmitter site