RF Exposure MPE

FCC ID: OWDTR-0160-E

RF Exposure Info

Download: PDF
FCCID_4023217

FCC Part 1.1307, 1.1310, 2.1091, 2.1093; IC RSS-102: RF Exposure MPE Calculations Including Co-location Considerations The maximum permissible RF exposure for an uncontrolled environment is specified in FCC 1.1310 table 1B and RSS-102 Issue 5 Table 4. RF Exposure Limits Uncontrolled Exposure Controlled Exposure Transmit FCC ISED FCC ISED Technology Frequencies Limit Limit Limit Limit (MHz) (mW/cm2) (mW/cm2) (mW/cm2) (mW/cm2) LMR 763 – 806 0.51 0.24 2.5 1.8 LMR 806 – 944 0.54 0.25 2.7 1.8 Bluetooth 2402 – 2480 1.0 0.54 5.0 3.2 2.4 GHz Wi-Fi 2412 – 2462 1.0 0.54 5.0 3.2 5 GHz Wi-Fi 5150 – 5825 1.0 0.90 5.0 4.6 * The lowest frequency of the above frequency ranges produces the most conservative limit (when limit is based on frequency) and was used to calculate the limits above, where applicable. Maximum Powers Max Max Max Transmit Duty Conducted Antenna EIRP Technology Frequencies Cycle Power Gain (W) (MHz) (%) (W) (dBi) LMR 763 – 806 50 18 5 56.9 LMR 806 – 944 50 21 5 66.4 Bluetooth 2402 – 2480 100 0.013 -9 0.002 2.4 GHz Wi-Fi 2412 – 2462 100 0.005 -9 0.001 5 GHz Wi-Fi 5150 – 5825 100 0.003 -9 0.001 * LMR power is based on rated power X 1.20 (per Part 90.205(s)) X 50% duty cycle (for licensed PTT radios) Calculated Minimum Safe Distance from LMR Antenna (based on maximum gain) Uncontrolled Exposure Controlled Exposure Transmit United United Technology Frequencies Canada Canada States States (MHz) (cm) (cm) (cm) (cm) LMR 763 – 806 94 137 43 50 LMR 806 – 944 99 145 44 50 Page 1 of 2

Co-location Considerations The configuration of this radio consists of a control head and the main body of the radio (VCH). The control head contains the Bluetooth and Wi-Fi transceivers and antenna, and the VCH contains the LMR transceiver circuitry which uses an antenna that is some distance away from both the control head and VCH (such as on the roof or trunk of a vehicle). Based on the distance between the control head and LMR antenna, one could say that these transceivers are not “co-located”. However, even if these transceivers were considered to be co-located, based upon inspection one can clearly see that the power density contributions of the Bluetooth and Wi-Fi transmitters are negligible compared to the power density of the LMR transmitter. Both the Bluetooth and Wi-Fi transmitters (considered “stand-alone”) would be exempt from both FCC and ISED RF exposure evaluation. FCC Exemption Calculation According to KDB 447498 D01 General RF Exposure Guidance v05 4.3.1. Standalone SAR test exclusion considerations, unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Exclusion Threshold condition, listed below, is satisfied. Limits The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR, where • f(GHz) is the RF channel transmit frequency in GHz • Power and distance are rounded to the nearest mW and mm before the calculation • The result is rounded to one decimal place for comparison The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion EUT RF Exposure The max conducted peak output power is 13 mW for the Bluetooth transmitter operating at 2402 MHz. The best case gain of the antenna is -9 dBi (0.13) numeric EIRP= 13 mW x 0.13 = 1.7 mW (rounding to the nearest mW = 2 mW) General RF Exposure = (2 mW / 5 mm ) x √2.402GHz = 06 Therefore, SAR test is not required since the result is below the ≤ 3.0 1-g SAR limit. ISED Exemption Statement The Bluetooth and Wi-Fi EIRPs are below the exemption limits in RSS-102 Issue 5 Table 1 at a separation distance of <= 5 mm. Page 2 of 2


Document Created: 2018-09-21 14:45:41
Document Modified: 2018-09-21 14:45:41
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC