For more than 16 years the Radio Astronomy Group of the ETH Zurich has used solar radio telescopes, which were designed to run automatically in an unmanned observing station. The antennas are azimuthally mounted and the position of each axis is measured with absolute shaft encoders. One antenna is driven by stepping motors while the two others use analog motors. The latest version of the antenna steering uses a velocity control of both axes. The antenna follows the Sun continuously and the velocity is adjusted due to the difference of nominal and actual position of the antenna. The Sun's position is calculated in real time using date and time as input parameters. Pointing to galactic objects is also possible and is used for system calibration (Cassiopeia A). The clock of the antenna control is synchronized each minute with a radio controlled time receiver. In addition, the antennas can be operated manually or remotely. A status signal inhibits data recording, if the antenna is not positioned.