At the output of the GPS1000 antenna head a DCF77 time telegram with Greenwich Meantime is available. The particular advantage is that the antenna, GPS receiver and GPS decoder are integrated in the antenna head as one unit and there is therefore no need to lay coaxial cables, nor to separately install the decoder together with power supply. Both the power supply of the antenna head and also the transmission of the DCF77 time telegram are via loop current by means of a shielded twin-core control