Figure 5.

Survey of the environment was conducted to assess distributed antenna system (DAS) antenna power output at distances of 32 feet (A), 8 feet (B), and 4 feet (C) away from the antenna. Shown here is average output in decibel milliwatts (dBm) plotted on a log scale with the spectrum analyzer centered at 800 MHz and a span of 200 MHz. For each plot, a minimum of 250 sweeps were made, with each sweep representing the average of 10 iterations at each of the 112 data points plotted. Note that the peak output in multiple frequencies increases by several orders of magnitude in close proximity to the antenna, and so does the overall power output. At amplitudes greater than –20 dBm, the field strength in most structures acting as antennas will potentially exceed 3 V/m for which non-life-saving instruments are designed.