Invisible
Systems
Limited
P a g e
|
19
7
‐
9
Beetham
Road,
Milnthorpe
Cumbria,
LA7
7QL,
Phone:
01539
722
520
Email:
info@invisible
‐
systems.com
QC0153
GSM
Signal
Analyser
17.
Aerial
Siting
ALWAYS
do a site survey to find the point of best signal before installation.
The aerial should normally be mounted vertically at the point of best signal. This is usually the
highest point in the building (often the loft area). For security applications, the position chosen
should be inside the protected area.
Large metal structures can affect radio signals. Therefore, whenever possible, avoid installing the
aerial directly under sheet metal roofs or within sheet metal-covered buildings because this will
reduce the signal strength. If this is unavoidable, the strongest signal will be found away from the
metal roof or close to large external windows or skylights.
Many large buildings closely spaced together will reduce the signal strength, particularly for
aerials on the lower floors, e.g. ground floor installation in city centres. The strongest signal will
normally be found close to external windows or skylights as high as possible.
Wherever possible, do not install the aerial close (2 metres) to sources of interfering signals.
These include: fluorescent or neon lighting, power distribution panels, power cable runs,
fridges, freezers, air-conditioning and ventilation equipment as well as electronic equipment,
e.g. photocopiers, fax machines, computers, televisions...
Reliable radio operation is unlikely with low signal strength, with an incorrectly installed aerial or
with strong interfering signals.
Use the GSM Signal Analyser to find the point of best signal. This means maximising the signal
strength.
The supplied short black aerial is for hand-held use, i.e. site surveys.
OR
Use an aerial adapter to connect and test a remote aerial.
Remember
: It is
always
easier to find the point of best signal before the equipment is fitted on
the wall. Moving aerials, cables, trunking... after installation is wasted time and effort.
