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Garmin G1000 Cockpit Reference Guide for the DA42
190-00406-05 Rev. B
10-15
SECTION 10 – HAZARD
AVOIDANCE
Safe Operating Distance
The zone in which the radiation level exceeds the US
Government standard of 1 mW/cm2 is the semicircular
area of at least 9.16 feet from the 10-inch antenna (Figure
10-23). All personnel must remain outside of this zone.
With a scanning or rotating beam, the averaged power
density at the Maximum Permissible Exposure Level
(MPEL) boundary is significantly reduced.
MPEL
Boundary
9.16’ for 10” antenna
Figure 10-23 MPEL Boundary
Vertical Change of Radar Beam (feet)
Change in Antenna Tilt
10 nm
0
1000
2000
3000
4000
1000
2000
3000
4000
-1°
-2°
-3°
-4°
+1°
+2
°
+3
°
+4
°
Figure 10-24 Vertical Change in Radar Beam per Nautical Mile
Basic Antenna Tilt Setup
Normally, the bottom of the radar beam is four degrees
below parallel with the ground.
With the aircraft flying level, adjust the antenna tilt so
ground returns are displayed at a distance that equals the
aircraft’s current altitude (AGL) divided by 1,000. For
example, if the aircraft is at 14,000 feet, adjust the tilt
so the front edge of ground returns are displayed at 14
nautical miles. Note this antenna tilt angle setting. Raise
the antenna tilt 6 degrees above this setting. The bottom
of the radar beam is now angled down 4 degrees from
parallel with the ground.
With the antenna tilt set as previously described, any
displayed target return should be scrutinized when flying
at altitudes between 2,000 and 30,000 feet AGL. If the
displayed target advances on the screen to 5 nautical of the
aircraft, avoid it. This may be either weather or ground
returns that are 2,000 feet or less below the aircraft.
Raising the antenna tilt 4 degrees can help separate ground
returns from weather returns in relatively flat terrain. This
will place the bottom of the radar beam parallel with the
ground. Return the antenna tilt to the previous setting
after a few sweeps.
This setup will provide a good starting point for
practical use of the GWX 68.
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