Download 868Mhz GSM Wireless Security System

Wireless Security Alarm System
UNDERSTANDING YOUR WIRELESS SECURITY SYSTEM
But here is an exception to the rule: The reception pattern is
weaker directly above and below the receiver. You can
improve communication by mounting transmitters horizontally
when working in those areas. This causes more patterns to fall
directly on the receiver.
The wireless security system is ideal for labor-intensive
installations but wireless also has limitations. And, like
hardwired systems, requires skill to install effectively.
The wireless systems consist of a receiver (control console) and
one or more transmitters (sensor detectors). The transmitters
alert the receiver when conditions change at a protected area.
The system integrity depends on the ability of the signal to
reach the receiver. Usually transmission problems are caused
by: Lack of range, Blocked or absorbed transmission, and Null
spots. Let‘s take a look at each situation:
LACK OF RANGE
Radio-waves travel outward like rings on the water. But they
are not limited to a flat surface.
Instead, they are
three-dimensional. The transmission patterns are shaped
somewhat like a donut with the hole filled in. The receiver has
a similar reception pattern. These patterns have implications
for locating equipment.
BLOCKED AND ABSORBED SIGNALS
Radio-waves pass through building materials with varying
success.
Plasterboard and wood scarcely affect transmissions. Nearly
95 to 100% of the signal will pass through.
The rule: Always mount transmitters and receivers vertically for
best communication.
90 - 100 %
Plasterboard
Mounting transmitters horizontally can disorient the antennas
and hamper reception
Light concrete and masonry construction will absorb
portions of the signal - 65 to 95% of the signal will pass through.
65 - 95 %
Light Concrete / Brick
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