rf exposure

FCC ID: RI7GE864

RF Exposure Info

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FCCID_1220624

Visonic Inc. FCC ID:RI7GE864
FCC ID:GSAPWRMAXPRO

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 maximum equivalent isotropically radiated power. The ERP of 25.62 dBm corresponds to
the equivalent isotropically radiated power EIRP of 27.8 dBm.

PT = 27.8 dBm = 603 mW.

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

2 2
P1 = 603 mW / 4π (20 cm) = 0.12 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 = 0.12 / 0.566 + 1.5 x 10-5 = 0.21 < 1.

2 2
Note: P1/Limit1 for 1850.2 – 1909.8 MHz is equal to 0.11 mW/cm / 1 mW/cm = 0.11, less than 0.21.
The peak transmitter output power 27.5 dBm plus maximum antenna gain 0 dBi, the maximum
equivalent isotropically radiated power EIRP is
PT = 27.5 Bm = 562 mW.
The power density P at 20 cm
2 2
P = 562 mW / 4π (20 cm) = 0.11 mW/cm .

RF_exposure_20004.doc Page 1 of 1

Document Created: 2009-12-20 10:57:18
Document Modified: 2009-12-20 10:57:18

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