MPE Calculations

FCC ID: PY3HE102

RF Exposure Info

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FCCID_185117

MPE Calculations
FCC part 1.1310, Table 1 limits the power density for uncontrolled exposure to 1mW/
cm2 for systems operating in the UNII bands. The distance, d(cm) from the antenna at
which the power density, Pd (mW/cm2 ) is below this limit is calculated from the
maximum EIRP, Pt (mW) using the equation:

Pd = Pt /(4 pd2 )

Re-arranging for the distance at which the power density is 1mW/cm2 gives:

d = √ (Pt /(4 p))

The device under test is designed to use an integral antenna with a gain of 6dBi. The
maximum output power across all channels is 19.8dBm, giving an EIRP of 25.8 dBm
(380 mW):

d = √ (380/(4 p)) = 5.5 cm (2.2”)

The distance from the antenna that the power density is 1mW/ cm2 is, therefore, 5.5cm.
The users guide instructs the user *(in two separate sections) to install the device such
that it has a separation of at least 20cm from persons (see text below) to comply with the
FCC’s requirements. This separation of 20cm more than meets the FCC’s and Industry
Canada rf exposure requirements.

Installation Note:
To ensure compliance with FCC RF exposure requirements, the antenna used for
this device must be installed to provide a separation distance of at least 20 cm
from all persons.

RF Exposure Requirements
To ensure compliance with FCC RF exposure requirements, the antenna used for this device must
be installed to provide a separation distance of at least 20 cm from all persons and must not be co-
located or operating in conjunction with any other antenna or radio transmitter. Installers and end-
users must follow the installation instructions provided in this user guide.

Document Created: 2019-11-09 14:12:49
Document Modified: 2019-11-09 14:12:49

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