MPE Estimates

FCC ID: KBCIX270-WL3945

RF Exposure Info

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FCCID_806412

Applicant: General Dynamics Itronix, Corporation FCC ID: KBCIX-MC5725 FCC ID: KBCIX270-WL3945 FCC ID: KBCIX270-BT2022 Co-Located Exposure Condition 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: General Dynamics Itronix, Corporation FCC ID: KBCIX-MC5725 FCC ID: KBCIX270-WL3945 FCC ID: KBCIX270-BT2022 MPE Estimates for Self Located Device FCC ID: KBCIX-MC5725 In the IX270 Host PC CDMA Ratio of General Max Peak Minimum Power Power Population Antenna Part Transmit Conducted Antenna Antenna Density Antenna Type Density Exposure No. 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 1851.25 - 1908.75 304.8 -1.50 0.89 0.035 1 0.035 PRIMARY WAN ANTENNA 59-0521-001R 824.7 – 848.31 325.8 1.50 1.50 0.065 0.55 0.118 External MaxRad BMLPVDB800/1900 1851.25 - 1908.75 304.8 3 2.77 0.064 1 0.064 External MaxRad BMLPVDB800/1900 824.7 – 848.31 325.8 3 3.33 0.060 0.55 0.109 Worst Case Ratio of Power Density to the Exposure Limit = 0.118 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: General Dynamics Itronix, Corporation FCC ID: KBCIX-MC5725 FCC ID: KBCIX270-WL3945 FCC ID: KBCIX270-BT2022 MPE Estimates for Self Located Device FCC ID: KBCIX270-WL3945 WLAN, IEEE 802.11 (a) (b) & (g) Ratio of General Power Max Peak Minimum Power Population Antenna Antenna Part Transmit Antenna Density to Conducted Output Antenna Density @ Exposure Type No. Frequency Gain the Power Cable Loss 20 cm Limit from 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 Power Max Peak Minimum Power Population Transmit Antenna Density to the Antenna Type Antenna Part No. Conducted Antenna Density @ Exposure Frequency Gain Exposure Output Power Cable Loss 20 cm Limit from Limit 1.1310 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 0.0032 1 0.0032 Worst Case Ratio of Power Density to the Exposure Limit = 0.0032 3

Applicant: General Dynamics Itronix, Corporation FCC ID: KBCIX-MC5725 FCC ID: KBCIX270-WL3945 FCC ID: KBCIX270-BT2022 Worst Case Co-located Exposure Condition FCC ID: KBCIX-MC5725 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 802.11abg Sum of Worst CDMA Radio Radio Radio Worst Case Ratios Worst Case Worst Case FCC Limit for Case Ratio of (Power Ratio of Power Ratio of Power Sum of Worst Power Density Density to the Density to the Density to the Case Ratios to the Exposure Exposure Exposure Limit Exposure Limit Limit Limit) 0.118 0.069 0.0032 0.1902 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: 2007-06-01 18:47:03
Document Modified: 2007-06-01 18:47:03
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