Park Air Systems 6525, User Documentation

Page: 38 / 54

31-3MDR00HB Page 38 Installation
Draft
Introduction
The instructions given in this topic involve connecting dangerous voltage to the MDR.
Installation must be carried out only by suitably qualified personnel.
The antenna used with the MDR 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=1.4PG/4
π
R
2
[Where S = power density; P = power input to antenna; G = antenna gain; R = distance
to centre of radiation and 1.4 = multiplication factor for average power based on a
modulation index of 90%.]
Based on this formula a 2 dBi antenna, the predicted safe distance from the centre of radiation would
be approximately 0.75 m for a field strength of 10 W/m
2
(1 mW/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 1.7 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 Radiofrequency Electromagnetic Fields in the
Frequency Range 3 kHz to 300 GHz', and also in FCC document OET Bulletin 65.
Ensure an antenna, or dummy load, is connected before switching on the MDR. There is high
RF voltage present at the antenna connector when the radio is keyed.
During installation an MDR may have to be lifted, possibly to head height, to fit onto
telescopic slides. At least two people should be used to lift the equipment. Failure to use
sufficient people when lifting equipment can result in personal injury.
The MDR's circuitry 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 ESSD 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 Dangerous Voltage
WARNING
Antenna Radiation
WARNING
Antenna Radiation
WARNING
Heavy Item
Caution
ESDs
Caution Unauthorized Modifications