YDI Wireless 2458-AL Wireless LAN User Manual RF Exposure
YDI Wireless Wireless LAN RF Exposure
Contents
- 1. rf exposure information
- 2. users manual 16 Oct 02
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
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