RF exposure

FCC ID: RYD-IBB683B

RF Exposure Info

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FCCID_1993097

$FCC ID : RYD-IBB683B RF EXPOSURE EVALUATION According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency(RF) Radiation as specified in §1.1307(b) Limits for Maximum Permissible Exposure(MPE) Frequency Electric Field Magnetic Field Power Average 2 Range(MHz) Strength(V/m) Strength(A/m) Density(mW/cm ) Time (A) Limits for Occupational/Control Exposures 300-1500 -- -- F/300 6 1500-100000 -- -- 5 6 (B) Limits for General Population/Uncontrol Exposures 300-1500 -- -- F/1500 6 1500-100000 -- -- 1 30 11.1 Friis transmission formula: Pd=(Pout*G)\(4*pi*R2) Where Pd= Power density in mW/cm2 Pout=output power to antenna in mW G= Numeric gain of the antenna relative to isotropic antenna Pi=3.1416 R= distance between observation point and center of the radiator in cm Pd the limit of MPE, 1mW/cm2. If we know the maximum gain of the antenna and total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached. 11.2 Measurement Result Antenna gain: 1dBi Modulation: GFSK Channel Channel Output Output Antenna Power density Power density Frequency Peak power Peak power Gain (dBi) at 20cm Limits (MHz) (dBm) (mW) Numeric (mW/ cm2 ) (mW/cm2 ) 1 2402 1.643 1.46 1.26 0.00037 1 40 2441 1.56 1.43 1.26 0.00036 1 79 2480 1.28 1.34 1.26 0.00034 1 Modulation: 1/4Π-DQPSK Channel Channel Output Output Antenna Power density Power density Frequency Peak power Peak power Gain (dBi) at 20cm Limits (MHz) (dBm) (mW) Numeric (mW/ cm2 ) (mW/cm2 ) 1 2402 -1.254 0.75 1.26 0.00019 1 40 2441 -1.352 0.73 1.26 0.00018 1 79 2480 -1.253 0.75 1.26 0.00019 1 Modulation: 8DPSK Channel Channel Output Output Antenna Power density Power density Frequency Peak power Peak power Gain (dBi) at 20cm Limits (MHz) (dBm) (mW) Numeric (mW/ cm2 ) (mW/cm2 ) 1 2402 -1.098 0.78 1.26 0.00019 1 40 2441 -1.203 0.76 1.26 0.00019 1 79 2480 -1.107 0.77 1.26 0.00019 1$

Document Created: 2013-06-17 12:40:30
Document Modified: 2013-06-17 12:40:30