Antenna Connections; Optimum Performance - Cisco CGR 1000 Series Getting Connected Manual

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Customer premises field depot
Before installing your antenna, determine the optimum location for safety and performance. Follow these steps to
determine a safe distance from wires, power lines, and trees:
1. Measure the height of your antenna.
2. Add this length to the length of your tower or mast, then double this total for the minimum safe clearance distance
from wires, power lines, and trees.
Caution: If you are unable to maintain this safe distance, stop and get professional technical assistance for a mounting
alternative.

Antenna Connections

Before you install or replace antennas, make sure the router is:
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Powered off
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Disconnected from all power sources
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Disconnected from the Field Area Network (FAN)
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Removed from a pole-top installation
Note: Caps on the N-connectors are installed on the CGR 1240 antenna ports to protect them from the environment.
They must only be removed to install the integrated antenna or the antenna RF cable.

Optimum Performance

The higher your antenna is above the ground, the better it performs, generally. It is good practice is to install your antenna
about 5 to 10 ft (1.5 to 3 m) above the roof line and away from all power lines and obstructions. If possible, find a
mounting place directly above your wireless device so that the lead-in cable can be as direct as possible.
Antennas transmit and receive radio signals which are susceptible to RF obstructions and common sources of
interference that can reduce throughput and range of the device to which they are connected. Follow these guidelines
to ensure the best possible performance:
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Install the antenna vertically and mount it with the cables pointing towards the ground.
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Keep the antenna away from metal obstructions such as heating and air-conditioning ducts, large ceiling trusses,
building superstructures, and major power cabling runs. If necessary, use a rigid conduit to lower the antenna away
from these obstructions.
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The density of the materials used in surrounding buildings' construction impacts antenna signal strength. Consider
the following
— Signals penetrate paper and vinyl walls with little change to signal strength.
— Signals penetrate only one or two solid and pre-cast concrete walls without degrading signal strength.
— Signals penetrate three or four concrete and wood block walls without degrading signal strength.
— Signals penetrate five or six walls constructed of drywall or wood without degrading signal strength.
— Signals are likely to reflect off a thick metal wall and not penetrate it at all.
— Signals are likely to reflect off a chain link fence or a wire mesh with spaces of 1 to 1-1/2 in (2.5 to 3.8 cm).
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