Reproducibility of GSM and UMTS EMF measurements

This contribution discusses the basic concepts of EMF measurements for compliance tests of mobile phone base stations in Switzerland. The employed maximum search method is explained and details of frequency selective field strength measurements of GSM and code domain power measurements of UMTS signals are investigated. After the discussion of the main influence factors on the reproducibility, the test set-up for the analysis is described. The use of a robot for a reproducible spatial positioning of the receiving antenna allows for comparison of GSM and UMTS signals under almost identical conditions. The results indicate that GSM 1800 as well as UMTS signals show a good reproducibility with deviations of 0.1-1.8 dB.