Garmin G500 Pilots Guide - Page 196
Operating Distance
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Foreword System Sec 1 PFD Sec 2 MFD Sec 3 Features Avoidance Hazard Sec 4 Additional Sec 5 Figure 4-58 Angle of Incidence A smaller incident angle gives the radar a larger detectable range of operation and the target display will show a higher intensity. Since more radar energy is reflected back to the antenna with a low incident angle, the resulting detectable range is increased for mountainous terrain. 4.8.3 Operating Distance The following information establishes a minimum safe distance from the antenna for personnel near an operating airborne weather radar. The minimum safe distance is based upon the FCC's exposure limit at 9.3 to 9.5 GHz for general population/uncontrolled environments which is 1 mW/cm2. See Advisory Circular 20-68B for more information on safe distance determination. Maximum Permissible Exposure Level (MPEL) The zone in which the radiation level exceeds the US Government stan- dard of 1 mW/cm2, is the semicircular area of at least 11 feet from the 12 inch antenna as indicated in the illustration below. All personnel must remain outside of this zone. With a scanning or rotating beam, the averaged power density at the MPEL boundary is significantly reduced. & Alerts Annun. Sec 6 Symbols Sec 7 Appendix A Glossary Sec 8 Index Appendix B 4-68 Garmin G500 Pilot's Guide 190-01102-02 Rev. B