User's Manual

M7X and M7R Page 4-3 Installation
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The transmit antenna must be installed such that the resultant radiated field strength is
below 10 W/m² in areas normally accessible to personnel.
The RF field strength from the antenna can be predicted from the equation S=1.45PG/4πR
2
[Where S = power density; P = power input to antenna; G = antenna gain; R = distance
to centre of radiation and 1.45 = multiplication factor for average power based on a
modulation index of 95%.]
Based on this formula, and using a 2 dBi antenna, the predicted safe distance from the centre of
radiation would be approximately 1.3 m for a field strength of 10 W/m
2
(1 W/cm
2
). This meets the
requirements of Health Canada Safety Code 6 for RF and microwave exposed workers.
For persons not classed as RF and microwave workers, and including the general public, the limit is
2 W/m
2
(0.2 mW/cm
2
) which increases the minimum safe distance to 2.9 m.
Further information on calculating the field strengths and power levels can be found in Health
Canada Safety Code 6 'Limits of Human Exposure to Radio Frequency Electromagnetic Fields in
the Frequency Range 3 Hz to 300 GHz', RSS 102 ‘Radio Frequency Exposure Compliance of
Radiocommunication Apparatus (All Frequency Bands)’ and also in FCC document OET Bulletin 5.
The M7 radio contains Electrostatic Sensitive Devices (ESDs). Personnel must be aware of
the precautions necessary to prevent damage to such devices. During installation all
precautions necessary to prevent ESD damage must be taken.
Changes or modifications made to this equipment that are not expressly approved by
Park Air, or parties authorized by Park Air, could void the user’s authority to operate the
equipment.
WARNING
Antenna Radiation
Caution ESDs
Caution Unauthorized Modifications