Ellipse INSTALLATION GUIDELINES
70-00159-01-09 Proprietary Redline Communications © 2015 Page 19 of 52 April 29, 2015
3 Site Survey
It is recommended to perform a site survey before installing the Ellipse system. The data
accumulated during this process is necessary to understand the operating
characteristics and obtain the best performance from the wireless system.
The site survey should identify the optimum location for mounting the wireless sector
controller. For maximum performance, there should be a direct line of sight between all
communicating wireless systems. A clear line-of-sight (LOS) path requires clearance
above natural and man-made objects by at least 60% of the First Fresnel zone. Each
antenna should be positioned to provide maximum clearance in the first Fresnel zone of
the direct signal path.
Figure 7: Site Survey: RF Planning Fresnel Zone
The wireless sector controller also functions under optical line-of-sight (OLOS)
conditions; where a clear straight line path exists between the two end points, but the
first Fresnel zone is not clear of obstacles. If the optical path is completely blocked, it
may be possible to establish a non line-of-sight (NLOS) path using RF signal reflections,
such as a common reflective structure (e.g., large building) that is LOS for the antennas
of communicating units.
For best results:
- Mount the antenna in a location that provides an unobstructed view of the horizon.
- Avoid mounting the antenna close to metal objects that may block/reflect the signal.
- To minimize susceptibility to radio interference, the antenna should generally be
located at least 1 m (~3.25 ft) away from any another high frequency system
antennas (e.g., microwave, GSM, CDMA, 3G) and should not be mounted within the
main beamwidth of any active (radiating) antenna system.
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