RF Exposure Info

FCC ID: NTA2WREP2

RF Exposure Info

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FCCID_2952502

ALLEGRO REPEATER (2WREPEATER), FCC ID:NTA2WREP2 February 4 2016 RF Exposure calculation 1. Absolute maximum specification of 2WREPEATER transmitter  Operational frequency band 450MHz to 470MHz  The 2WREPEATER transmitter is measured for MAX RF Power 5W  Absolute Maximum transmission time(duration) for any 2WREPEATER transmitters does not exceed 0.32 s  Transmission period‐absolute maximum is 3 transmission per hour  ALL 2WREPEATER transmitters utilize 4GFSK modulation 2. Average RF Power Calculation FCC regulation on permissible RF exposure are not based on the peak envelope power, but on average power (P_ave) over a 30‐minute time period for uncontrolled environments. As mentioned in (1), during any 30 minutes 2WREPEATER can transmit 1.5 times. Duration is 0.32 second. With maximum RF radiation equal to 15.8W, the average RF Power over 30 minutes is: P_ave(worst case) at 30 minute=15.8×1.5×0.32/30×60=4.2mW 3. Maximum radiated Power Density prediction (S): The predict power density (S) at distance R=20cm from transmitter with P_ave =4.2mW, next formula is used: S=P_ave/(4×π× ) For the worst case prediction of power density at or near a transmitter surface let’s use: S=P_ave/(4×π× )=4.2mW/(4×3.14×20cm×20cm)=0.084mW/ This is the worst case of the near field power density of 2WREPEATER transmitter. 4. Maximum Permissible Exposure (MPE) from 2WREPEATER As FCC require, the maximum permissible exposure for general public in “uncontrolled situation” at 20 cm is: MPE=frequency[MHz]/1500=460MHz/1500=0.307mW/ Compare results in (4) and (5), S=0.084mW/ <MPE=0.307mW/ We see that 2WREPEATER fully complies with RF safety at a distance 20cm.


Document Created: 2017-11-23 04:17:52
Document Modified: 2017-11-23 04:17:52
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