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11.1.2
Antenna and Surge Protection
Additional to the cell phone modem kit an antenna is required for deployment
and operation. For most locations, a 3dB antenna will be suitable for remote
operation. In low signal areas however, a 6.5dB antenna may be necessary.
Signal gain is increased by the power rating of the antenna and reduced by the
length of connecting coaxial cable. For every 5m of cable the effectiveness of
an antenna will be reduced by about 1.75dB.
An external antenna is a risk to sensitive electronics within an enclosure if a
lightning strike hits the station. Campbell Scientific Australia has a surge
protector available suitable for bulkhead mounting with an FME to N-Type
adapter cable and N-Type external connection for the antenna Antennas used in
conjuction with this will need to include an N-Type termination antenna rather
than an FME type.
For more information, conact a Campbell Scientific Australia Application
Engineer.
If the Intelimax is being used to replace a Modmax,
SAM3G+ or other modem with SMA antenna connection, a
FME to SMA adaptor will be necessary to allow the
Intelimax to be attached to the existing antenna cable.
11.1.3
Mounting Equipment
The Intelimax is supplied with a mounting bracket for mounting in
environmental enclosures. The modem can be easily removed from this bracket
if necessary.
Antenna mounts will differ depending on the type and size of the antenna, for a
suitable mount for your enclosure or tower please contact Campbell Scientific
Australia.
12.
SMS
This section is for users who write their own datalogger programs. SMS is a
function available in many of the modems on the market today. When used
with a datalogger, SMS can be a useful tool for alarming, and/or for controlling
the datalogger remotely. Each modem has a range of commands used to send
an SMS and to check, read and delete messages received. Below are some of
the commands that can be used with 3G and GSM modems including the
Intelimax.
Replacing Modems