Neptune 13458-000, Installation And Maintenance Manual

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Site Recommendations
These sites require extra care when determining a location to
install the antenna.
The following are recommendations for sites with multiple
transmitters, receivers, and antennas.
l
Avoid mounting the antenna so that it is at the same height as
another on the site, regardless of the frequencies.
l
Mount the antennas one above the other (if possible) for sites
that have multiple antennas. Separate each antenna by at least
10 feet. This minimizes the interference between the systems.
l
Exception to the previous rule is for cellular antennas. As long
as the antenna is either above, below, or in the middle of the
ring of cell antennas, the two systems can coexist without
inference.
l
Antenna sites that must share space with multiple transmitting
systems could require additional equipment to protect the
systems from interfering with each other. These sites could also
require additional engineering to make them perform well.
l
If there are radio systems at the site that are already operating
on the frequency band, it can be advantageous to combine the
signals into one antenna system using the appropriate
equipment. This often works better than attempting to protect
the individual systems from interfering with each other.
l
Managed antenna sites can require additional equipment, and
might dictate how an installation is to be performed. Follow
the site's requirements as long as the installation meets
Neptune's minimum requirements.
Antenna Requirements
Consider the following.
l
The antenna, if mounted on the side of a tower or other
supporting structure, must be mounted so that it is at least
5 feet away from the structure. The components to offset the
antenna are specific to the installation and are not provided by
Neptune.
l
The antenna must be carefully hoisted up a tower so that it is
not damaged.
102 R900 Gateway Installation and Maintenance Guide
Appendix C RF Antenna and Coax Installation