YDI Wireless 2458-AL Wireless LAN User Manual RF Exposure

YDI Wireless Wireless LAN RF Exposure

Contents

rf exposure information

Notice in Installation Manual:
FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment when installed as directed. This equipment should be
installed and operated with fix-mounted antennas that are installed with a
minimum of 2 meters of separation distance between the antenna and all persons’
body during normal operation.
RF Exposure Calculations:
The following information provides the minimum separation distance for the
highest gain antenna provided with the Model: CA2458 Converter with Agere
Extended WLAN Card, as calculated from FCC OET 65 Appendix B, Table
1B Guidelines for General Population/Uncontrolled Exposure. This calculation is
based on the highest EIRP possible from the system, considering maximum power
and antenna gain, and considering a 1.0 mW/cm^2 uncontrolled exposure limit.
The Friss formula used was:
S = (Po*G) / (4*Pi*r^2) or r = (Po*G) / (4*Pi*S)
Where S = 1.0 mW/cm^2 for 5800 MHz
Where Po = 250 mW (Peak RF)
Where G = Isotropic antenna gain (numeric)
Where r = Minimum Safe Distance from antenna (cm)
For: 27 dBi Dish Antenna - …… r = 100 cm
The following table lists the antennas that will be provided with the
system:
Authorized Antennas
Model Antenna Type Antenna
Gain
(dBi)
Max
EIRP
(dBm)
MPE Distance
(CM)
A5.8FP23 One foot dish 24 48 71
A5.8FP27 Two foot dish 27 51 100
A5.8-1’ One foot flat panel 24 48 71
A5.8-2’ Two foot flat panel 27 51 100
A5.8HP90-16 Uni-directional antenna 16 40 28
Notes:
1. MPE distance figures are based on a conservative “worse case” prediction, i.e. +24
dBm into antenna and using formula S=EIRP/(4piR²) and no calculation for duty
factor. In practice the minimum distance will be much shorter. (Ref. 2)
2. The minimum MPE distance has been calculated for the maximum allowed Power
Density (S) limit of 1.0 mW/cm2 in the Frequency range 1500-100,000 MHz for
uncontrolled environments (Ref. 2).
Reference:
1. FCC Part 15, sub-clause 15.247 (b) (4)
2. FCC OET Bulletin 65, Edition 97-01
3. FCC Supplement C to OET Bulletin 65, edition 97-01

Navigation menu