Laserfiche WebLink
■ <br /> 10/ 19/83 3910.3A <br /> intensity has diminished to a value that equals the PEL. For each FAA <br /> radar capable of producing levels in excess of the PEL, the distance to <br /> that point has been calculated (Figure 3-3). The distance calculations <br /> were made using typical transmitting parameters and should be considered <br /> estimates. They should be authenticated with actual transmitting data <br /> and by field measurements whenever possible. <br /> The PEL for ASR and AN/FPS-6/90 radars, read directly from Figure 3-1, is <br /> 5 mW/cm2 power density (E2 = 20,000 V2/m2; H2 = 0.125A2/m2). <br /> The PEL for ARSR, AN/FPS-20, and AN/FPS-60 radars is calculated using the <br /> relationships shown in Figure 3-1. For an ARSR transmitting at 1315 MHz, <br /> the PEL is 4.4mW/cm2 power density (E2 = 17,533 V2/m2; <br /> H2 = 0. 110 A2/m2). All radar work areas in which the PEL's are <br /> exceeded shall be considered hazardous. <br /> FIGURE 3-3. RADARS CAPABLE OF PRODUCING POWER <br /> DENSITIES IN EXCESS OF THE PEL <br /> Calculated Distance <br /> from Antenna to <br /> Point on Main Beam <br /> Average Axis Where Power <br /> Transmitter Power Transmitter Density Equals the <br /> Used for Calculations Frequency PEL PEL <br /> Radar Peak Average <br /> (MW) MHz) (mW/cm2) (feet) <br /> ASR-4,5,6 0.425 403 2800 5.0 40 <br /> ASR-7 0.5 474.5 2800 5.0 50 <br /> ASR-8 1.4 (Simplex) 875 2800 5.0 125 <br /> 1.4 (Diplex) 1750 2800 5.0 235 <br /> ARSR-1,2 5.0 3595 1315 4.4 295 <br /> ARSR-3 4.6 (Simplex) 3140 1315 4.4 230 <br /> 4.6 (Diplex) 6280 1315 4.4 460 <br /> AN/FPS-6/90 2.8 2040 2800 5.0 360 <br /> AN/FPS-20 2.0 4319 1300 4.3 315 <br /> AN/FPS-60 2.0 (Simplex) 4319 1300 4.3 315 <br /> 2.0 (Diplex) 8638 1300 4.3 630 <br /> Chap 3 <br /> Par 36 Page 29 <br />