18
Maximizing Range
Under favorable conditions the ZW-CM can achieve a, line of sight, wireless link
distance of up to 300m. Generally, most indoor applications will not be able to achieve
these distances, although steps can be taken to maximize range. Ensure the Receiver
and End Device are located away from large obstacles and other RF sources such as
Wireless Access points and microwaves. Keep objects clear of the zone between the
End Device and Receiver. Metal objects, walls, and cubical partitions in particular will all
significantly reduce the signal strength.
Care must be taken in the positioning of the device to ensure that the internal
antenna achieves the best possible range. When possible, the ZW-CM antenna should
be parallel to the Receiver antenna.
Keep the device away from dense or metallic structures. Metallic structures should
be kept away by at least 0.8" (2 cm), although 2.4" (6 cm) is recommended. Objects too
close to the antenna may screen the ZW-CM from the Receiver. Reflections off nearby
objects can also cause destructive interference reducing received signal strength.
For long distance connections the ZW-CM and the Receiver should be elevated to
keep the signal from being attenuated by the ground. Elevate each device by at least
0.6 meters above the ground for each 100 meters or separation. It is best to keep this
same clearance distance to walls, ceilings and other obstructions as well.
Figure A.2 – Received Power Chart
0
10
20
30
40
50
60
70
80
90
100
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
Si
gna
l St
re
ng
th
[%
]
Power [dBm]
Signal Strength vs Received Power
