An observation performed with a HBA station on September 5, 2009 at 13:13:48 UTC in which redundancy calibration fails (top), as well as an observation with the same station at 23:02:01 UTC in which the redundancy calibration is successful (bottom). The left panels show the measured visibilities for three distinct types of redundant baselines. The right panels show the local sky model at the time of observation, where the strongest sources on the sky are superimposed on a contour plot of the element beam pattern at 170 MHz.