Site security devices: Six different types of site security devices were examined during the series of tests (Jenkins et al., 1973b; Donaldson and Jenkins, 1972). These devices were (1) radar intrusion detectors, (2) microwave motion detectors, (3) proximity detectors, (4) infrared detectors, (5) security television cameras, and (6) seismic/magnetic detectors. Two devices from different manufacturers were tested in each category. The security television cameras received additional testing to determine if there were any significant differences in interference susceptibility with either VIDICON, PLUMBICON, TIVICON, or EPICON tubes in the cameras. No significant differences were noted. Interference thresholds for these devices are: Interference thresholds reported for security TV cameras were measured with the environmental housing that normally surround these cameras. These measurement results are summarized in Figures 1 through 3. Also shown in the figures are typical power densities that can be expected at various distances from an SPS rectenna. It should be noted that the SPS power densities are approximate as the exact values are site dependent and can be affected by other SPS rectennas in the vicinity. The power density estimate labeled multiple satellite is typical of what might be expected at relatively large distances (1000 km or greater) in a multiple satellite configuration of 60 or more SPS rectennas spread throughout the United States.
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