YDI Wireless 2458-AL 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)

A5.8FP23 One foot dish 24 48 71

A5.8FP27

A5.8-1’

A5.8-2’ Two foot flat panel 27 51 100

A5.8HP90-16 Uni-directional antenna 16 40 28

Two foot dish

One foot flat panel

27 51 100

24 48 71

Max

EIRP

(dBm)

MPE Distance

(CM)

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