Guardian Manual 001-5006-000 Rev 0
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2.4.6
RF EXPOSURE COMPLIANCE REQUIREMENTS
The Guardian radio is intended for use in the Industrial Monitoring and Control and SCADA markets. The Guardian
unit must be professionally installed and must ensure a minimum separation distance listed in the table below
between the radiating structure and any person. An antenna mounted on a pole or tower is the typical installation
and in rare instances, a 1/2-wave whip antenna is used.
Table 2-2 – RF Exposure Compliance Minimum Safety Distances
Antenna Gain
5 dBi
10 dBi
15 dBi
Min Safety Distance
(VHF @ max power)
123cm
218.8cm
389cm
Min Safety Distance
(UHF @ max power)
105.7cm
188cm
334.4cm
Min Safety Distance
(900 MHz @ max power)
63.8cm
115 cm
201.7 cm
Note: It is the responsibility of the user to guarantee compliance with the FCC MPE regulations when operating
this device in a way other than described above.
The Guardian radio uses a low power radio frequency transmitter. The concentrated energy from an antenna may
pose a health hazard. People should not be in front of the antenna when the transmitter is
operating.
The installer of this equipment must ensure the antenna is located or pointed such that it does not emit an RF field
in excess of Health Canada limits for the general population. Recommended safety guidelines for the human
exposure to radio frequency electromagnetic energy are contained in the Canadian Safety Code 6 (available from
Health Canada) and the Federal Communications Commission (FCC) Bulletin 65.
Any changes or modifications not expressly approved by the party responsible for compliance (in the country
where used) could void the user's authority to operate the equipment.
2.5
TERRAIN AND SIGNAL STRENGTH
A line of sight (LOS)
path between stations is highly desirable and provides the most reliable communications link
in all cases. A line of sight path can often be achieved by mounting each station antenna on a tower or other
elevated structure that raises it high enough to clear surrounding terrain and other obstructions.
The requirement for a clear transmission path depends on the distance to be covered by the system. If the system
is to cover a limited distance, say 3-5 miles, then some obstructions in the transmission path may be tolerable. For
longer-range systems, any obstruction could compromise the performance of the system, or block transmission
entirely.
RF E
