Garmin G1000 King Air C90GT - Manual (Page 339)

190-00663-01 Rev. A Garmin G1000 Pilot’s Guide for the Hawker Beechcraft C90A/GT 325
HAZARD AVOIDANCE
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
a
ngle of
i
nciDence
The angle at which the radar beam strikes the target is called the Angle of Incidence. The figure illustrates
the incident angle (‘A’). This directly affects the detectable range, the area of illumination, and the intensity
of the displayed target returns. A large incident angle gives the radar system a smaller detectable range and
lower display intensity due to minimized reflection of the radar energy.
Figure 6-47 Angle of Incidence
A smaller incident angle gives the radar a larger detectable range of operation and the target display shows
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.
SAFE OPERATING DISTANCE
The following information establishes a minimum safe distance from the antenna for personnel near
operating weather radar. The minimum safe distance is based on 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.