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Installing your end device in an application were the unit will be
exposed to ambient temperatures above or below the operating
limits specified in this manual will damage your unit and cause
the unit to malfunction and produce incorrect operation.
5.3.2 Installation
When installing your receiver it is important to position your device in such a
way as to optimize the antenna location within what's known as the "Fresnel
Zone".
The Fresnel Zone can be thought of as a football-shaped invisible tunnel between
two locations that provides a path for RF signals between your End Device and
your receiver.
END DEVICE
In order to achieve maximum range, the football-shaped path in which radio
waves travel must be free of all obstructions. Obstacles in the path (especially
metal) will decrease the communication range between your
connector/transmitter and receiver. Also, If the antennas are mounted just barely
off the ground, over half of the Fresnel zone ends up being obstructed by the
earth resulting in significant reduction in range. To avoid this problem, the
antennas should be mounted high enough off of the ground so that the earth
does not interfere with the central diameter of the Fresnel zone.
It is important to understand that the environment may
change over time due to new equipment or machinery being
installed, building construction, etc. If new obstacles exist
between your End Device and receiver, the devices can be
raised on one end or on both ends to hopefully clear the
Fresnel Zone of obstructions.
C UTION:
FRESNEL ZONE
Figure 5-13. Fresnel Zone
NOT :
5
End Device Operation
RECEIVER
ANTENNA
5-10
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