MPE Estimates 2

FCC ID: KBCIX270-WL3945

RF Exposure Info

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FCCID_694042

Applicant: Itronix, Corporation FCC ID’s: KBCIX270-MC8765, KBCIX270-WL3945, KBCIX270-BT2022 Compliance with 47 CFR 15.247(i) “Systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy levels in excess of the Commission's guidelines. See § 1.1307(b)(1) of this chapter.” The EUT will only be used with a separation distance of 20 centimeters or greater between the antenna and the body of the user or nearby persons and can therefore be considered a mobile transmitter per 47 CFR 2.1091 (b). Calculations are provided for each radio transmitting through its own internal antenna and optional external antenna. The total transmit power is less than 1.5 W (ERP), therefore the EUT is categorically excluded from routine environmental evaluation per 47 CFR 2.1091(c). The MPE estimates are as follows: Table 1 in 47 CFR 1.1310 defines the maximum permissible exposure (MPE) for the general population. The exposure level at a 20 cm distance from the EUT’s transmitting antenna is calculated using the general equation: S = (PG)/4πR2 Where: S = power density (mW/cm2) P = power input to the antenna (mW) G = numeric power gain relative to an isotropic radiator R = distance to the center of the radiation of the antenna (20 cm = limit for MPE estimates) PG = EIRP Solving for S, the maximum power densities 20 cm from the transmitting antennas are summarized in the tables on the following pages: 1

Applicant: Itronix, Corporation FCC ID’s: KBCIX270-MC8765, KBCIX270-WL3945, KBCIX270-BT2022 MPE Estimates for Self Located Device FCC ID: KBCIX270-MC8765 Edge/GSM/GPRS/HSDPA/UMTS Ratio of General Max Peak Minimum Power Power Population Transmit Conducted Antenna Antenna Density Antenna Type Antenna Part No. Density Exposure Frequency Output Gain Cable to the @ 20 cm Limit from Power Loss Exposure 1.1310 Limit IX270 (MHz) (mW) (dBi) (dB) (mW/cm2) (mW/cm2) PRIMARY WAN ANTENNA 59-0521-001R 1850.2 817 -1.5 0.89 0.094 1 0.094 PRIMARY WAN ANTENNA 59-0521-001R 837.0 1611 1.5 1.50 0.320 0.56 0.574 External MaxRad BMLPVDB800/1900 1850.2 817 3 2.77 0.171 1 0.171 External MaxRad BMLPVDB800/1900 837.0 1611 3 3.33 0.297 0.56 0.532 Duty Cycle For GPRS (the worst case) is 0.25% Worst Case Ratio of Power Density to the Exposure Limit = 0.574 Duty Cycle not taken in to account Excerpts from TCB Training, April 3, 2002, “Mobile Transmitters”, Slide 6: “Devices operating in multiple frequency bands ‰ When RF exposure evaluation is required for TCB approval o Separate antennas – estimated minimum separation distances may be considered for the frequency bands that do not require evaluation or TCB approval, however, the estimated distance should take into account the effect of co-located transmitters. (Note 24) Note 24 According to multiple frequency exposure criteria, the ratio of field strength or power density to the applicable exposure limit at the exposure location should be determined for each transmitter and the sum of these ratios must not exceed 1.0 for the location to be compliant.” The sum of the ratio(s) (power density to the exposure limit) does not exceed 1.0; therefore, the exposure condition is compliant with FCC rules. 2

Applicant: Itronix, Corporation FCC ID’s: KBCIX270-MC8765, KBCIX270-WL3945, KBCIX270-BT2022 MPE Estimates for Self Located Device FCC ID: KBCIX270-WL3945 WLAN, IEEE 802.11 (a) (b) & (g) Ratio of General Max Peak Minimum Power Power Population Transmit Conducted Antenna Antenna Density to Antenna Type Antenna Part No. Density Exposure Frequency Output Gain Cable the @ 20 cm Limit from Power Loss Exposure 1.1310 Limit 2 2 (GHz) (mW) (dBi) (dB) (mW/cm ) (mW/cm ) PiFa MAIN TWR12WIPI02A 5 100 -2.56 6.5 0.002 1 0.002 PiFa MAIN TWR12WIPI02A 2.4 318 -2.72 3.5 0.015 1 0.015 External MaxRad MAXC24503 2.4 318 3 4.6 0.044 1 0.044 External MaxRad BMAXC24505 2.4 318 5 4.6 0.069 1 0.069 Worst Case Ratio of Power Density to the Exposure Limit = 0.069 MPE Estimates for Self Co-located Device FCC ID: KBCIX270-BT2022 Bluetooth Radio General Ratio of Max Peak Minimum Power Population Power Transmit Conducted Antenna Antenna Type Antenna Part No. Antenna Density @ Exposure Density to Frequency Output Gain Cable Loss 20 cm Limit from the Exposure Power 1.1310 Limit 2 2 (MHz) (mW) (dBi) (dB) (mW/cm ) (mW/cm ) Well Green Technology Co. Ltd. IX270-B/T or R12Y-B/T TWR12BLPI01A 2441 36.22 -2.56 0.69 0.003 1 0.003 Worst Case Ratio of Power Density to the Exposure Limit = 0.003 3

Applicant: Itronix, Corporation FCC ID: KBCIX270-MC8765 FCC ID: KBCIX270-WL3945 FCC ID: KBCIX270-BT2022 Worst Case Co-located Exposure Condition FCC ID: KBCIX270-MC8765 FCC ID: KBCIX270-WL3945 FCC ID: KBCIX270-BT2022 Per Note 24 shown below, the Sum of Worst Case Power Ratios cannot exceed 1.0 Bluetooth Edge/GPRS/ 802.11abg Sum of Worst Radio GSM Radio Radio Worst Case Ratios Worst Case FCC Limit for Worst Case Case Ratio of (Power Ratio of Power Sum of Worst Ratio of Power Power Density Density to the Density to the Case Ratios Density to the to the Exposure Exposure Exposure Limit Exposure Limit Limit Limit) 0.574 0.069 0.003 0.646 1.0 - PASS The results shown in the above table are equivalent to the Sum of the EIRP of the Two Co-located Transmitters (EIRP TX1 + EIRP TX2) compared to the exposure limit. The benefit of this method, is that accounts for transmitters operating at different frequencies against different exposure limits. 4


Document Created: 2006-08-15 13:45:26
Document Modified: 2006-08-15 13:45:26
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