Aerial Siting
ALWAYS do a site survey to find an area of strong signal before installation.
The aerial should be mounted vertically at the point of strongest signal. This is
usually the highest point in the building (often the loft area). Remember, for
security reasons, the position chosen should be inside the protected area.
Large metal structures can affect radio signals. Avoid installing the aerial
directly under metal roofs or within metal skinned buildings because this will
reduce the signal strength and may inhibit operation completely. If this
is unavoidable, the strongest signal will be found away from the metal roof or
close to large external windows or skylights.
Avoid installing the aerial close (2 metres) to cable runs, ducting, structural
metalwork, metal pipes, water tank, electronic equipment, e.g. photocopiers,
fax machines etc. These can have similar effects as metal roofs.
The Signal Strength LEDs on the front of the Dualcom (see Fig 1 & 2 and
Appendix 1) will give an indication of FSSI signal strength. This is the signal
strength that the Dualcom is receiving from the VDN Base Station. These will
not work with an unprogrammed NVM.
Green On: High Signal Strength
Red & Green On: Medium Signal Strength
Red On: Low Signal Strength
Red & Green Off No signal available.
You can use a Dualcom, aerial and fully charged battery to survey a proposed
site for the point of strongest signal. Ensure that the Dualcom is fitted with a
programmed NVM and is fully operational. Walk around the site carrying the
Dualcom, aerial and battery observing the signal strength LEDs. When you
have identified the point of the strongest signal, make a note of this point (accu-
rate to 20cm) and use it when installing the Dualcom aerial.
To achieve a more accurate reading, we strongly advise that a RSSI test (signal
strength received by the base station) is performed. A reading of +15 or higher
is strongly recommended.
CSL can provide the CS1051 Installers Radio Test Set. The CS1051 may be
used to align the aerial for maximum signal strength. It will also identify sources
of interference and test the integrity of the radio path. See page 14. Contact a
Help Desk for more information.
CSL strongly recommend the use of this test unit when installing VDN Dualcom
products.
11
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