RF exposure

FCC ID: EW780-8181-01

RF Exposure Info

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FCCID_1484622

INTERTEK TESTING SERVICES

For RF exposure evaluation of the parent unit, the output power for portable
transmitters is defined as the higher of the conducted or radiated (EIRP) source-
based time averaging output power. And the low threshold is equal to (60/fGHz) mW,
where fGHz is mid-band frequency in GHz.

For the parent unit of the tested model of VM321 PU, the measured peak conducted
power was 88.5 mW. The maximum source-based time averaging duty factor in four-
baby operation is 8.58

The conducted source-based time averaging output power
= (88.5 * 0.0858) mW
= 7.59 mW

The measured maximum field strength (FS) was 115.9 dBμV/m. The distance (D)
between the antenna and the equipment under test (EUT) was 3 meters. From these
data, the radiated (EIRP) source-based time-averaging output power can be
calculated by:

The radiated power = (FS*D)2 / 30 mW
= 116.71 mW

The radiated (EIRP) source-based time-averaging output power
= (116.71 * 0.0858) mW
= 10.01 mW

The low threshold in the 2400 – 2483.5MHz band is 24.57 mW.

From the above calculation, output power 10.01 mW obtained in both method is less
than the threshold 24.57mW, it is concluded that the parent unit can be exempted
from SAR evaluation.

FCC ID:EW780-8181-01
RF exposure - 1 of 1

Document Created: 2011-06-16 16:51:52
Document Modified: 2011-06-16 16:51:52

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