Garmin GMR xHD3 Radar Installation Instructions - Page 16

Antenna Specifications Specification Type Horizontal beam width Horizontal side lobes Vertical beam width Antenna gain Polarization Measurement End-fed slotted waveguide 4 ft. antenna: 1.8 degrees 6 ft. antenna: 1.1 degrees -23 dB within ±10 degrees of main -30 dB outside ±10 degrees of main 23º 4 ft. antenna: 27 dB 6 ft. antenna: 29 dB 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