User's Manual

SBS-900 Shore Based Radar Systems
Chapter 2: Health & Safety warnings
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 8 of 240
2.3 Radiation hazards
Radiation hazard: non-ionising
Avoid exposure to the main beam of a stationary radar antenna.
Avoid standing closer than 2 metres from the central front face of the antenna.
Users of cardiac pacemakers should be aware of the possibility that radio frequency
transmissions can damage some devices or cause irregularities in their operation.
Anyone using such devices should understand the risks present before exposure.
2.4 Microwave radiation levels
The Council of the European Union Recommendation 1999/519/EC (Annex III table 2) specifies the
maximum RF non-ionising field strength (power density) safe range for human exposure averaged
over a six minute period as 10W/m
2
in a frequency band of 10 to 300GHz.
Calculations for all SBS-900 systems show that the rotating antenna safe distance is within the
antenna turning circle although KH do not recommend any personnel to be in close proximity to a
rotating antenna due to RF exposure and the high risk of injury that can be caused by a rotating
antenna.
SBS-900 system State
Range Within Which the
Power Density Exceeds
10W/m
2
X-band
3.7m or 5.5m standard
antenna
Rotating antenna 1.3m
Non-rotating Antenna 3.0m
S-band
3.9m standard antenna
Rotating antenna 1.2m
Non-rotating Antenna 3.0m
X-band
Enhanced 5.5m antenna
Rotating antenna 1.7m
Non-rotating Antenna 4.0m
X-band
Enhanced 6.4m antenna
Rotating antenna 2.0m
Non-rotating Antenna 5.0m
The safe range for a non-rotating antenna is far greater due to the lack of averaging but this is not a
permitted operational mode and the system includes interlocks to prevent this mode of operation for a
prolonged period.
Note: 5m of waveguide is assumed.