32 |
P a g e
C.3 Maximizing Range
Under favorable conditions the ZW-REC can achieve a line of sight wireless link distance of up
to 1000m. 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
microwave. 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.
The antenna provided with the ZW-REC is a dipole. Care must be taken in the positioning of
the antenna to achieve the best possible range. The gain of the antenna is lower along the
axis of the antenna. Do not point the ZW-REC Antenna in the direction of an End Device.
When possible, The ZW-REC antenna should be parallel to the End Device antenna. If the End
Device does not have an external antenna the longest dimension of the End Device itself
should be parallel to the antenna of the ZW-REC.
Keep the antenna 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-REC from End Devices. Reflections off of nearby objects can also
cause destructive interference reducing received signal strength.
For long distance connections the Receiver and the End Device 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.
0
10
20
30
40
50
60
70
80
90
100
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
Signa
l Str
e
n
gth
[
%]
Power [dBm]
Signal Strength vs Recieved Power
Figure 30. Received Power Chart
