RF Exposure Info

FCC ID: RI7GE863L

RF Exposure Info

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FCCID_892527

Visonic Ltd. FCC ID:RI7GE863L

RF exposure limit according to FCC CFR 47part 1, §1.1307, §1.1310

The calculation was done for power density at 20 cm distance for GSM and 315 MHz transmitters
operating simultaneously, no limit exists for 125-128 kHz transmitter.
Simultaneous transmission by GSM module in 824.2 –848.8 MHz and 1850.2 – 1909.8 MHz is not
possible. The maximum output power of GSM module (in 824.2 –848.8 MHz) was taken for
calculation.
2
Limit for power density for general population/uncontrolled exposure is f/1500 mW/cm
for 300 – 1500 MHz frequency range.

The following must be true:

Power density 1(P1)/Limit1 + Power density 2/Limit2 < 1.

1) Operating frequency range 824.2 –848.8 MHz.
2
Limit1 = 849/1500 = 0.566 mW/cm

2 2
The power density P (mW/cm ) = PT / 4π r , where
PT is the transmitted power, which is equal to the peak transmitter output power
31.42 dBm plus maximum antenna gain 1.5 dBi, the maximum equivalent isotropically radiated power
EIRP is

PT = 31.42 dBm +1.5 dBi = 32.92 dBm = 1958.8 mW.

The power density P at 20 cm (minimum safe distance, required for mobile devices),
calculated as follows:

2 2
P1 = 1958.8 mW / 4π (20 cm) = 0.39 mW/cm

2) Operating frequency range 315 MHz.
2
Limit2 = 300/1500 = 0.2 mW/cm

The 315 MHz transmitter EIRP is 0.015 mW.
2
P2 = 0.015 mW / 4π (20 cm) = 3 x 10-6

P1/Limit1 + P2/Limit2 = 0.39 / 0.566 + 1.5 x 10-5 = 0.68 < 1.

2 2
Note: P1/Limit1 for 1850.2 – 1909.8 MHz is equal to 0.2 mW/cm / 1 mW/cm = 0.2, less than 0.68.
The peak transmitter output power 28.71 dBm plus maximum antenna gain 1.5 dBi, the maximum
equivalent isotropically radiated power EIRP is
PT = 28.71 dBm +1.5 dBi = 30.21 dBm = 1050 mW.
The power density P at 20 cm
2 2
P = 1050 mW / 4π (20 cm) = 0.2 mW/cm .

RF_exposure_17925.doc Page 1 of 1

Document Created: 2008-01-07 16:17:02
Document Modified: 2008-01-07 16:17:02

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