Weiskirchen transmitter

The Weiskirchen transmitter broadcast on 594 kHz. Until the conversion of medium-wave transmission frequencies to nine divisible kilohertz values, its transmission frequency was 593 kHz. Until 1994 the transmitting power was 400 kW when it was reduced to 300 kW.

Weiskirchen transmitter has a directional antenna, which consists of two 126.5-metre-tall guyed lattice steel mast radiators (50°3′19.7″N 8°51′44.9″E / 50.055472°N 8.862472°E / 50.055472; 8.862472 and 50°3′22.8″N 8°51′57.1″E / 50.056333°N 8.865861°E / 50.056333; 8.865861) insulated against ground.

As opposed to other guyed masts used for medium wave transmission, its guys are not partitioned with insulators. Instead, they are grounded over coils situated close to the anchor block, which are tuned so that high frequency currents in the guys are as low as possible.^{[citation needed]}

The Weiskirchen transmitter forms together with Hoher Meissner transmitter a single frequency network. The directive pattern of the transmitter has a maximum toward northwest and two minima pointing toward northeast and southeast. By regulation of the feeding power for each mast, the directivity pattern can be changed, in cooperation with Hoher Meissner transmitter the maximum even to the east.

A signal is transmitted by cable from the studio in Frankfurt to Weiskirchen transmitter. The transmitter uses two water-cooled final stages, which are switched in parallel, in order to avoid complete transmitter failure in case of a failure of a single tube. The power supply comes under normal conditions from the local 20kV electric grid.^{[citation needed]}

For backup power, a Diesel generator, starts after 10 to 20 seconds. The current for starting the generator is supplied by a small accumulator unit, which is connected automatically at power failure. If the Diesel generator is used as power source, transmission power is reduced to 100 kW.^{[citation needed]}