The total power of the four receivers has been recorded during approx 2000 s with 2.5 s integration time, while they were staring at an ambient load. The detected output came from the cable processors. The results are presented in Figure 2.
Figure 2: Stability of the total power output of two new and two ``old'' receivers. The graphs show the fractional deviation of the detected power (normalized to its mean) versus time in s.