HBG was a low frequency time signal transmitter for the Swiss time reference system. It transmitted on 75 kHz with 20 kW power, and was located in Prangins, Switzerland.Due to the cost of urgently needed renovation for the ageing antennas, and the ease with which all existing users could switch to the DCF77 time signal, the Swiss Federal Government decided to shut down HBG at the end of 2011.