MTX
‐
3G
‐
JAVA
Family
www.mtx
‐
terminals.com
www.mtxm2m.com
2015/10
v1.6
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87
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109
MTX
M2M®
by
MATRIX
ELECTRONICA
S.L.U
9.3.3
Antenna
placement
The
antenna
should
be
placed
away
from
electronic
devices
and
other
antennas.
The
recommended
minimum
distance
between
adjacent
antennas,
operating
in
a
similar
radio
frequency
band,
is
at
least
50cm.
If
the
signal
strength
is
weak,
it
is
useful
to
face
a
directional
antenna
towards
the
closest
radio
base
station.
This
can
increase
the
strength
of
the
signal
received
by
the
modem.
The
modem’s
peak
output
power
can
reach
2W.
RF
field
strength
varies
with
antenna
type
and
distance.
At
10cm
from
the
antenna
the
field
strength
may
be
up
to
70V/m
and
at
1m
it
will
have
reduced
to
7V/m.
In
general,
CE
‐
marked
products
for
residential
/commercial
areas
and
the
light
industry
can
withstand
a
minimum
of
3V/m.
9.3.4
The
antenna
cable
Use
50
Ω
impedance
low
‐
loss
cable
and
high
‐
quality
50
Ω
impedance
connectors
(frequency
range
up
to
3GHz)
to
avoid
RF
losses.
Ensure
that
the
antenna
cable
is
as
short
as
possible.
The
Voltage
Standing
‐
Wave
Ratio
(VSWR)
may
depend
on
the
effectiveness
of
the
antenna,
cable
and
connectors.
In
addition,
if
you
use
an
adaptor
between
the
antenna
cable
and
the
antenna
connector,
it
is
crucial
that
the
antenna
cable
is
a
high
‐
quality,
low
‐
loss
cable.
Minimize
the
use
of
extension
cables,
connectors
and
adapters.
Each
additional
cable,
connector
or
adapter
causes
a
loss
of
signal
power.
9.3.5
Possible
communications
disturbances
Possible
communication
disturbances
include
the
following:
•
Noise
can
be
caused
by
electronic
devices
and
radio
transmitters.
•
Path
‐
loss
occurs
as
the
strength
of
the
received
signal
steadily
decreases
in
proportion
to
the
distance
from
the
transmitter.
•
Shadowing
is
a
form
of
environmental
attenuation
of
radio
signals
caused
by
hills,
buildings,
trees
or
even
vehicles.
This
can
be
a
particular
problem
inside
buildings,
especially
if
the
walls
are
thick
and
reinforced.
•
Multi
‐
path
fading
is
a
sudden
decrease
or
increase
in
the
signal
strength.
This
is
the
result
of
interference
which
is
caused
when
direct
and
reflected
signals
reach
the
antenna
simultaneously.
Surfaces
such
as
buildings,
streets,
vehicles,
etc.,
can
reflect
signals.
•
Hand
‐
over
occurs
as
you
move
from
one
cell
to
another
in
the
GSM
network.
Your
mobile
application
call
is
transferred
from
one
cell
to
the
next.
Hand
‐
over
can
briefly
interfere
with
communication
and
may
cause
a
delay,
or
at
worst,
disruption.
