Fig. 1
From: Exposure to 3G mobile phone signals does not affect the biological features of brain tumor cells
Exposure system setup. The vector signal generator generates a modulated TD-SCDMA signal. The amplifier is used to amplify the original signal. The power meter (PM2) attached to a directional coupler can provide an additional monitor path for stable exposure. First, the power meter PM1 (including the attenuator, Att1) is connected to the cable to measure the forward power at the location of the connector (x) to the dipole. The signal generator is adjusted to the desired forward power at the connector, as read by power meter PM1, after attenuation (Att1), which also was coupled to PM2. After connecting the cable to the dipole, the signal generator was readjusted for the same reading at power meter PM2 as before. Throughout the exposure period, the reading of PM2 was kept constant to ensure that the power feed into the dipole was stable, which guaranteed stable exposure