Common use of Background noise Clause in Contracts

Background noise. During the calibration background noise is also recorded. In a separate measurement the frequency spectrum of the background has been determined and is then subtracted from the calibration signal spectrum. Typically, the background noise is several orders of magnitude below the signal strength. This is even the case for the component |Hθ,vert| with lowest LPDA sensitivity. For large zenith angles close to 90◦ and in the case of the component |Hθ,vert| also for small zenith angles directly above the radio station, however, the background noise and the signal can be of the same order of magnitude. In this case, the calibration signal spectrum constitutes an upper limit of the LPDA |Hφ| [m] 60 ◦ Θ ◦ 45 30 ◦ 15 ◦ ◦ 55 MHz 0 2017 JINST 90 ◦ 7 8 9 10 75 ◦ 60 ◦ Θ 45 ◦ 30 ◦ ◦ 15 ◦ 55 MHz 0 12 90 ◦ |Hθ,hor| [m] ◦ 75 60 ◦ Θ 45 ◦ 30 ◦ 15 ◦ ◦ 55 MHz 0 T10005 90 ◦