base station antenna, see chamber and setup details
Abstand zw. exponiertem Objekt und Expositionsquelle
The provocation experiments were performed in a specially designed exposure chamber where background levels of both power frequency and radio frequency fields were low enough. The subjects were seated in a semi-reclining chair in front of an LCD computer screen. The antennas were mounted on an adjustable wooden framework surrounding the subject's chair. The antennas were placed one on each side of the subject's head at a distance of 8.5 cm. The head was positioned between two wooden bars in order to ensure a well-defined location during the provocation (exposure/sham).
A test GSM 900 mobile phone was used as signal generator. The RF signal was power amplified and fed to a power attenuator unit to adjust the signal level. The signal was further directed to a power divider allowing the signal to reach a power meter and the left or right antenna or a dummy load via a remotely controlled selector. Only the right antenna was used for the RF exposure; the left antenna served solely as a dummy.
The subjects were tested on two separate days, one day with sham exposure and one with true exposure in random order.
Two Allgon 7336 base station antennas were selected, due to their pattern of emission. The SAR distribution from the antenna was measured with a DASY 3 system at AMC Centurion AB. The antenna was placed 8.5 cm from the head phantom during measurements.
Huber R et al.
Radio frequency electromagnetic field exposure in humans: Estimation of SAR distribution in the brain, effects on sleep and heart rate.
Eltiti S et al.
Does short-term exposure to mobile phone base station signals increase symptoms in individuals who report sensitivity to electromagnetic fields? A double-blind randomized provocation study.
Heinrich S et al.
Elektromagnetische Felder einer UMTS-Mobilfunkbasisstation und mögliche Auswirkungen auf die Befindlichkeit - eine experimentelle Felduntersuchung
Barker AT et al.
The effect of GSM and TETRA mobile handset signals on blood pressure, catechol levels and heart rate variability.