Operating Distance - Garmin G500 Pilot's Manual

A smaller incident angle gives the radar a larger detectable range of opera-
tion 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 gen-
eral population/uncontrolled environments which is 1 mW/cm
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/cm
2
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.
4-68
Figure 4-58 Angle of Incidence
, is the semicircular area of at least 11 feet from the 12
Garmin G500 Pilot's Guide
2 . See Advisory
190-01102-02 Rev. B