Airlink ASB-7MA Quick Installation Guide - Page 6

Basic, Setup, Operation

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Basic Antenna Tutorial Basic Setup and Operation Radio frequencies lose significant strength when traveling through building structures such as walls and floors. Using high gain indoor antenna will boost the wireless signal, providing a solution to the loss of signal strength. If you have an Access Point/Wireless Router in a network environment that is physically small, an omni-directional antenna attached to the Access Point/Wireless Router may suffice. However, if the network client is located in an area where wireless signals are hard to reach, a directional (patch) antenna attached to the network client (receiving end) may be required. If you want to extend the physical range of the wireless signal, you need to use two directional (patch) antennas pointed at each other. If you use only one high gain antenna on one side and one normal antenna on the other side, the signal from the high gain antenna will reach the other side, but the signal from the normal antenna will not be able to return back. The following table lists the attenuation (signal loss) of going through various kinds of barrier: Barriers Thin wall Wood wall Closed aluminum transom Barred window with wooden frame Barred window with steel frame Steel shelves/cupboards Brick wall Concrete wall Concrete ceiling Elevator Typical attenuation @ 2.4GHz 2-5 dB 5 dB 8 dB 4-5 dB 10 dB 15 dB 6-12 dB 10-20 dB 20 dB 20-30 dB 05

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Basic
Setup
and
Operation
Radio
frequencies
lose
significant
strength
when
traveling
through
building
structures
such
as
walls
and
floors.
Using
high
gain
indoor
antenna
will
boost
the
wireless
signal,
providing
a
solution
to
the
loss
of
signal
strength.
If
you
have
an
Access
Point/Wireless
Router
in
a
network
environment
that
is
physically
small,
an
omni-directional
antenna
attached
to
the
Access
Point/Wireless
Router
may
suffice.
However,
if
the
network
client
is
located
in
an
area
where
wireless
signals
are
hard
to
reach,
a
directional
(patch)
antenna
attached
to
the
network
client
(receiving
end)
may
be
required.
If
you
want
to
extend
the
physical
range
of
the
wireless
signal,
you
need
to
use
two
directional
(patch)
antennas
pointed
at
each
other.
If
you
use
only
one
high
gain
antenna
on
one
side
and
one
normal
antenna
on
the
other
side,
the
signal
from
the
high
gain
antenna
will
reach
the
other
side,
but
the
signal
from
the
normal
antenna
will
not
be
able
to
return
back.
The
following
table
lists
the
attenuation
(signal
loss)
of
going
through
various
kinds
of
barrier:
Barriers
Typical
attenuation
@
2.4GHz
Thin
wall
2-5
dB
Wood
wall
5
dB
Closed
aluminum
transom
8
dB
Barred
window
with
wooden
frame
Barred
window
with
steel
frame
10
dB
Steel
shelves/cupboards
15
dB
Brick
wall
6-12
dB
Concrete
wall
10-20
dB
Concrete
ceiling
20
dB
Elevator
20-30
dB
4-5
dB
05