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Minimum Safe Operating Distances
When it is transmitting, the radar should be located in a position on the vessel that is at least this far
from people. IEC 60936-1, clause 3-27.1, specifies the maximum distances from the antenna at which radio
frequency (RF) levels can be expected.
These minimum safe distances apply for a transmitting radar with a rotating antenna, and are much larger
when the antenna is not rotating. If rotation of the antenna is obstructed for any reason, the transmitter will
automatically turn off.
IMPORTANT: The specified 100 W/m
occupational user and the specified 10 W/m
Under such configuration, the radio frequency radiation exposure limits set forth for a population/uncontrolled
environment are satisfied.
Model
GMR Fantom 54
GMR Fantom 56
GMR Fantom 124
GMR Fantom 126
GMR Fantom 254
GMR Fantom 256
Antenna Specifications
Specification
Type
Horizontal beam width
Horizontal side lobes
Vertical beam width
Polarization
2
minimum distance must be maintained between the antenna and the
2
must be maintained between the antenna and the general public.
100 W/m²
0.12 m (4.72 in.)
0.13 m (5.11 in.)
0.19 m (7.48 in.)
0.20 m (7.87 in.)
0.27 m (10.63 in.)
0.28 m (11.02 in.)
Measurement
End-fed slotted waveguide
4 ft. antenna: 1.8 degrees
6 ft. antenna: 1.25 degrees
-23 dB within ±10 degrees of main
-30 dB outside ±10 degrees of main
22 degrees
Horizontal
50 W/m²
0.17 m (6.69 in.)
0.18 m (7.09 in.)
0.26 m (10.24 in.)
0.28 m (11.02 in.)
0.38 m (14.96 in.)
0.40 m (15.75 in.)
10 W/m²
0.38 m (14.96 in.)
0.40 m (15.75 in.)
0.59 m (23.23 in.)
0.62 m (24.41 in.)
0.85 m (33.46 in.)
0.90 m (35.43 in.)
15
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