RF exposure

FCC ID: RI7GG864

RF Exposure Info

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FCCID_1685930

RF Exposure / RF Technical Brief BABT TCB Balfour House, Churchfield Road, Walton-on-Thames, Surrey, KT12 2TD ATTN: Reviewing Engineer RF exposure information for the equipment GG864-2.4 (FCC ID: RI7GG864, IC: 5131A-GG864) The device GG864-2.4 (FCC ID: RI7GG864, IC: 5131A-GG864) is designed to be used only for fixed and mobile applications. The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all the persons and must not be co-located or operating in conjunction with any other antenna or transmitter. The table below is excerpted from RSS-102, Issue 4, 4.2, titled “RF Limits for Devices used by the General Public”: Frequency Range Power density Power density Averaging time 2 2 (MHz) (W/m ) (mW/cm ) (minutes) 300 – 1500 f (MHz)/150 f (MHz) /1500 6 1500 – 15000 10 1.0 6 The table below is excerpted from Table 1B of 47 CFR 1.1310 titled Limits for Maximum Permissible Exposure (MPE), Limits for General Population/Uncontrolled Exposure: 2 Frequency Range (MHz) Power density (mW/cm ) Averaging time (minutes) 300 – 1500 f (MHz) /1500 30 1500 – 100.000 1.0 30 Based on the above tables the limits are: 2 For 850 MHz frequency band device: 0.55 mW/cm 2 For 1900 MHz frequency band device: 1 mW/cm 2 For 2.4 GHz frequency band device: 1 mW/cm Using the equation: PG S= 4π R 2 2 where: S = power density (in appropriate units, e.g. mW/cm ) P = power input to the antenna (in appropriate units, e.g., mW) G = power gain of the antenna in the direction of interest relative to an isotropic radiator R = distance to the center of radiation of the antenna (appropriate units, e.g., cm) Compliance with MPE limits can be guaranteed as the calculation below shows: 850 MHz frequency band Maximum output power: 33.25 dBm (2113.49 mW) Maximum antenna gain: 7 dBi (5.01 numerical gain) Maximum eirp: 40.25 dBm (10.59 W < FCC/IC EIRP power limit (11.5 W)) 2 2 Maximum exposure: 0,5268 mW/cm < RF Limits for Devices used by the General Public (0.55 mW/cm )

1900 MHz frequency band Maximum output power: 29,10 dBm (812,83 mW) Maximum antenna gain: 3,90 dBi (2,45 numerical gain) Maximum eirp: 33 dBm (1.99 W < FCC/IC EIRP power limit (2 W)) 2 2 Maximum exposure: 0,0992 mW/cm < RF Limits for Devices used by the General Public (1mW/cm ) 2.4 GHz frequency band Maximum output power: 12.92 dBm (19.59 mW) Maximum antenna gain: 2.2 dBi (1,66 numerical gain) Maximum eirp: 15.12 dBm (0.033 W < FCC/IC EIRP power limit (4 W)) 2 2 Maximum exposure: 0,0065 mW/cm < RF Limits for Devices used by the General Public (1mW/cm ) Co-transmission MPE Frequency Frequency Range S S/MPE Mode limit Band (MHz) (mW/cm2) 2 limit (mW/cm ) GSM 850 GSM/GPRS 824,2 - 848,8 0,1744 0,5500 0,3172 PCS 1900 GSM/GPRS 1850,2 - 1909,8 0,0992 1,0000 0,0992 2,4 GHz 802.15.4 2400-2483,5 0,0065 1,0000 0,0065 S/MPE limit Co-transmission S/MPE primary + Equipment Compliance SCENARIO limit S/MPE limit secundary GSM 850 GSM/GPRS 0,3172 Scenario 1 0,3236 COMPLIANT 2,4 GHz ZigBee 802.15.4 0,0065 PCS 1900 GSM/GPRS 0,0992 Scenario 2 0,1057 COMPLIANT 2,4 GHz ZigBee 0 0,0065


Document Created: 2012-04-26 13:37:07
Document Modified: 2012-04-26 13:37:07
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