A non time nut friend did send me this link which should be of interest Bert Kehren _http://www.radionet-eu.org/rda/archive/NA4-EN-SU-012-021_W.%20Schl%C3%BCter %20Fundamental%20Station%20Wettzell.pdf_ (http://www.radionet-eu.org/rda/archive/NA4-EN-SU-012-021_W.%20Schlüter%20Fundamental%20Station%20Wettzell.pdf)