Antenna Specifications
Specification
Measurement
Type
End-fed slotted waveguide
Horizontal beam width
4 ft. antenna: 1.8 degrees
6 ft. antenna: 1.1 degrees
Horizontal side lobes
-23 dB within ±10 degrees of main
-30 dB outside ±10 degrees of main
Vertical beam width
23º
Antenna gain
4 ft. antenna: 27 dB
6 ft. antenna: 29 dB
Polarization
Horizontal
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.
Model
100 W/m²
50 W/m²
10 W/m²
GMR 434 xHD3
0.09 m (3.54 in.)
0.13 m (5.11 in.)
0.28 m (11.02 in.)
GMR 436 xHD3
0.09 m (3.54 in.)
0.13 m (5.11 in.)
0.30 m (11.81 in.)
GMR 1234 xHD3
0.15 m (5.91 in.)
0.22 m (8.66 in.)
0.49 m (19.29 in.)
GMR 1236 xHD3
0.16 m (6.30 in.)
0.23 m (9.06 in.)
0.51 m (20.08 in.)
GMR 2534 xHD3
0.16 m (6.30 in.)
0.22 m (8.66 in.)
0.50 m (19.69 in.)
GMR 2536 xHD3
0.17 m (6.69 in.)
0.23 m (9.06 in.)
0.52 m (20.47 in.)
16
