Minimal and maximal values of system temperature are shown in the last two columns. Warning level 2 and 3 indicate on severe problems which lead to a noticeable degradation of the performance. Warning level 4 means that the data are too noisy that may be unusable. Local radio interference or failure of a cooling system are the most probable reasons. Argument of the plot is time in hours elapsed from the first observation of the session.
Values are in Kelvins.
The index of the video-converter and its sky central frequency are displayed at the top of each plot. A normalized amplitude of a phase calibration signal should be stable. However in the presence of spurious signals , the amplitude of phase cal signal is changed. In the case when spurious signals have constant amplitude, harmonic variations can be detected in the plots of dependence of the normalized amplitude of phase cal to its phase. Model of spurious signals in phase calibration signal is built and its parameters are estimated.