Garmin GWX 70 Installation Manual - Page 5

Safe Distance Determination, Maximum Permissible Exposure Level Mpel, Gwx 70 Installation Manual - radar

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SAFE DISTANCE DETERMINATION 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 10 mW/cm2. See Advisory Circular 20-68B for more information on safe distance determination. The GWX 70 safe distance determination given below in the table is based on lower exposure limits of 1 mW/cm2 than what is specified in AC 20-68B. Antenna Size 10" 12" 18" Safe Distance 7.4 ft 9.6 ft 14 ft MAXIMUM PERMISSIBLE EXPOSURE LEVEL (MPEL) The zone in which the radiation level exceeds the 1 mW/cm2, is the semi-circular area within a radius of 7.4 ft from the 10" antenna, 9.6 ft from the 12" antenna, and 14 ft from the 18" antenna as indicated in the illustration below. All personnel must remain outside of this zone. The distance to the MPEL boundary is calculated upon the basis of each antenna available with the GWX 70 system, nominal average output power of the transmitter, and in the non-rotating or bore sight position of the antenna (see example calculations above). With a scanning or rotating beam, the averaged power density at the MPEL boundary is significantly reduced. 190-00829-01 Rev. C GWX 70 Installation Manual Page iii

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190-00829-01
GWX 70 Installation Manual
Rev. C
Page iii
SAFE DISTANCE DETERMINATION
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 10 mW/cm
2
. See Advisory
Circular 20-68B for more information on safe distance determination.
The GWX 70 safe distance determination given below in the table is based on lower exposure limits of
1 mW/cm
2
than what is specified in AC 20-68B.
MAXIMUM PERMISSIBLE EXPOSURE LEVEL (MPEL)
The zone in which the radiation level exceeds the 1 mW/cm
2
, is the semi-circular area within a radius of
7.4 ft from the 10” antenna, 9.6 ft from the 12” antenna, and 14 ft from the 18” antenna as indicated in the
illustration below. All personnel must remain outside of this zone. The distance to the MPEL boundary is
calculated upon the basis of each antenna available with the GWX 70 system, nominal average output
power of the transmitter, and in the non-rotating or bore sight position of the antenna (see example
calculations above). With a scanning or rotating beam, the averaged power density at the MPEL boundary
is significantly reduced.
Antenna Size
Safe Distance
10”
7.4 ft
12”
9.6 ft
18”
14 ft