Xetawave XETA4-TMFA, Руководство пользователя

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4
462.7375 – 467.5375 MHz
467.7375 – 470 MHz
FCC Antenna Compliance
Since professional installation is required, standard RF connectors are used. Adapters or
custom coaxial cables may be required to connect the radio’s RF connector to the
desired antenna.
Any antenna from a reputable manufacturer with desired bandwidth, gain/pattern
coverage, and a rated nominal impedance of 50 ohms, can be used.
FCC Exposure Compliance
FCC ID:
PEJ-938240
It is the responsibility of the licensee or user to guarantee compliance with the
appropriate MPE regulations when operating this device in a way other than described
herein. The installer of this equipment must ensure the antenna is located or oriented
such that it does not emit an RF field in excess of the guidelines in FCC OET Bulletin 65
and 47CFR § 1.1310.
People should not be near the antenna when the radio link is operating as general
practice and maintain a safe distance as calculated below.
The MPED (Maximum Permissible Exposure Distance) is calculated using the FCC limit
for a general population/uncontrolled exposure in the 450 - 470 MHz frequency band.
To calculate safe distance
:
( )( )( )
( )( )
mit ExposureLi
n AntennaGai DutyCycle ower ConductedP
MPED
π
4
=
Where:
MPED is Maximum Permissible Exposure Distance or safe distance in cm;
ConductedPower is the power delivered to the antenna in mW;
ExposureLimit is the limit for General Population/ Uncontrolled exposure in mW/cm
2
All quantities are calculated in linear or numeric quantities.
The XETA4-TMFA transmitter duty cycle varies depending on many factors. Packet sizes,
which are set up by the installer as part of the radio/network configuration, are a
primary determinant. At power up and with no data payload, the radios will transmit a
beacon with a duty cycle of 6 to 10%, depending upon modulation setting. The duty
cycle will increase when a data payload is transmitted, but will also be influenced by
network configuration, network type, number of radios in the network, propagation