MPE Estimates

FCC ID: RIC-MLOG01

RF Exposure Info

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FCCID_490450

Compliance with 47 CFR 15.247(i) “Systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy levels in excess of the Commission's guidelines. See § 1.1307(b)(1) of this chapter.” The EUT operates in the 902 – 928 MHz band with a peak output power of 21.38 mW EIRP. It is a hybrid spread spectrum transmitter that utilizes five hopping channels. The radio is part of a data logger that is installed on water service pipes. The EUT will only be used with a separation distance of 20 centimeters or greater between the antenna and the body of the user or nearby persons and can therefore be considered a mobile transmitter per 47 CFR 2.1091(b). The radio utilizes a single integral PCB etch antenna. Since the transmit frequency is less than 1.5 GHz, and the output power is less than 1.5 W ERP, the EUT is categorically excluded from routine environmental evaluation per 47 CFR 2.1091(c). The MPE estimates are as follows: Table 1 in 47 CFR 1.1310 defines the maximum permissible exposure (MPE) for the general population as (f MHz/1500) mW/cm2. The exposure level at a 20 cm distance from the EUT’s transmitting antenna is calculated using the general equation: S = (PG)/4πR2 Where: S = power density (mW/cm2) P = power input to the antenna (mW) G = numeric power gain relative to an isotropic radiator R = distance to the center of the radiation of the antenna (20 cm = limit for MPE estimates) PG = EIRP Solving for S, the maximum power density 20 cm from the transmitting antenna is summarized in the following table: MPE Estimate FCC ID: RIC-MLOG01 General Max Peak Power Transmit Population Antenna Type Manufacturer Part No. Output Power Density @ 20 Frequency Exposure Limit - EIRP cm from 1.1310 (MHz) (mW) (mW/cm2) (mW/cm2) PCB Etch Flow Metrix MLOG 902 21.38 0.004 0.601333333 The power density does not exceed 0.601 mW/cm2 at 20 cm; therefore, the exposure condition is compliant with FCC rules. The applicant’s radio, FCC ID: RIC-MLOG01, is compliant with the requirements of 15.247(i).


Document Created: 2004-11-18 09:35:50
Document Modified: 2004-11-18 09:35:50
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