MM-010539-001, Rev. P6G
14
1.8 RF ENERGY EXPOSURE INFORMATION FOR FIXED OPERATION
1.8.1 Maximum
Permissible Exposure Limits
DO NOT TRANSMIT
with this Client and antenna when persons are within the MAXIMUM
PERMISSIBLE EXPOSURE (MPE) Radius of the antenna. The MPE Radius is the minimum distance
from the antenna axis that ALL persons should maintain in order to avoid RF exposure higher than the
allowable MPE level set by the FCC.
FAILURE TO OBSERVE THESE LIMITS MAY ALLOW ALL PERSONS
WITHIN THE MPE RADIUS TO EXPERIENCE RF RADIATION
ABSORPTION, WHICH EXCEEDS THE FCC MAXIMUM PERMISSIBLE
EXPOSURE (MPE) LIMIT. IT IS THE RESPONSIBILITY OF THE STATION
LICENSEE TO ENSURE THAT THE MAXIMUM PERMISSIBLE EXPOSURE
LIMITS ARE OBSERVED AT ALL TIMES DURING STATION
TRANSMISSION. THE STATION LICENSEE IS TO ENSURE THAT NO
BYSTANDERS ARE WITHIN THE RADIUS LIMITS.
1.8.2 Determining MPE Radius
THE MAXIMUM PERMISSIBLE EXPOSURE RADIUS
is unique for each site and is determined
based on the complete installation environment (i.e. co-location, antenna type, transmit power level, etc.).
Determination of the MPE distance is the responsibility of the VIDA Broadband user. Calculation of the
MPE radius is required as part of the installation. The Limit for
Uncontrolled Exposure Power Density
(
P
d
) is 10 W/m
2
for fixed mounted device.
The M/A-COM 4.9 GHz VIDA Broadband Client may be installed as a fixed mounted radio. After
installation and commissioning, the safe distance from the 9 dBi omni-directional antenna is greater than
20 cm (8-inches).
1.8.2.1 MPE Calculation for omni-directional Antenna
This MPE Minimum Distance Calculation is based on using a 9 dBi gain omni-directional antenna
mounted directly to the Client RF port.
Basic M/A-COM 4.9 GHz VIDA Broadband Client specifications:
P
: Maximum Peak Conducted Power = 27 dBm
G
: Maximum Omni Antenna Gain = 9 dBi
Frequency Range = 4.94 to 4.99 GHz
R
: Minimum Distance between User and Antenna = 0.2 m
Equation from FCC:
P
d
= P * G
N
/ ( 4 *
π
* Rmin
2
)
P
d
= 0.5 W * 7.94 / (4 * 3.1415926 * 0.2
2
) = 7.9 W / m
2
< 10 W / m
2
The calculation indicates that the minimum 0.2 meter distance between user and the omni-directional
antenna (directly mounted to the Client RF port) is required when operating the M/A-COM 4.9 GHz
VIDA Broadband Client.
