Figure 4-70 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.

4.10.3Operating 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.

4.10.3.1Maximum Permissible Exposure Level (MPEL) (GWX 68)

The zone in which the radiation level exceeds the US Government standard 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.

4.10.3.2Maximum Permissible Exposure Level (MPEL) (Other Radars)

See the appropriate documentation for MPEL.

Foreword

 

 

System

Sec 1

 

PFD

Sec 2

 

Sec 3 MFD

 

Sec 4 Hazard Avoidance

Features

Additional

Sec 5

& Alerts

Annun.

Sec 6

Symbols

Sec 7

 

Glossary

Sec 8

 

Appendix A

 

 

Index

Appendix

 

 

B

 

190-00601-02 Rev. E

Garmin G600 Pilot’s Guide

4-85

Page 245
Image 245
Garmin G600 manual Operating Distance, Maximum Permissible Exposure Level Mpel GWX