The electromagnetic spectrum from 1 Hz to 9.4 GHz near ground level in the region of São José dos Campos, SP, Brazil

Abstract

In the period from June 2012 to May 2013 measurements of the electromagnetic spectrum from 1 Hz to 9.4 GHz were collected in São José dos Campos, SP, Brazil. At this site, the electromagnetic spectrum is produced by both natural and artificial sources. The intensities of the electric and magnetic fields were measured in two frequency ranges (1 Hz to 1 MHz, and 1 MHz to 9.4 GHz) with hand-held detectors and compact antennas. Measurements were performed in sweep-time mode and changing precision in the resolution bandwidth (RBW). Main peaks in the spectrum correspond to Schumann resonances at 7.8, 14, 20 and 33 Hz, emissions by power lines, radio frequencies, navigational radio beacons, mobile phone and Wi-Fi systems, C- and X-band radars (ground stations and on board aircraft).