It was confirmed that the DRM power is about 80 Watts RMS into a quarter wave Ground Plane Antenna placed 10 m above ground.
Today the "reception" was limited to just over two minutes of decoded audio during a 12 minutes segment (see log). The Channel Impulse Response behaved differently today compared to previous loggings: Today there were two impulses about 1 ms apart. The second peak was considerably stronger and varied less than the first.
The signal came back later in the afternoon, but never gained enough strength to produce any audio.
PS: Many thanks to DW for the kind information on the DW Relay Station.