VoxiPlus
Advanced
INSTALLATION MANUAL
© 2008 TOPEX S.A.
page
22
2.6
Mobile antennas
The TOPEX equipment may use different types of individual (discreet) or collective antennas.
The standard issues are stick-type magnetic-base antennas, while upon request, special antennas
are available, such as high-gain, directional Yagi type (see details below).
The basic version of TOPEX VoxiPLUS uses GSM boards with a single RF connector,
allowing you to use just one antenna for connection to mobile network. For this, the GSM card has an
internal 4:1 combiner/splitter and a single antenna connector. The advanced version uses UAB4M
mobile cards that have no internal combiner so they feature one antenna for each GSM. This way
you may use for each mobile module an antenna directed towards the base station for the respective
mobile network. Also, no combiners means less attenuation, so the level of the RF signal of the
mobile networks will be higher.
If you don’t need directional antennas targeted to a specific location, you can always use an
external combiner if you want to have fewer antennas.
The antennas have a 2,5 m connection cable and a base with magnet for fastening to a
ferrous support. The base is heavy, so the antenna will stand upright even if you place it on a flat
surface that is not metallic.
Note:
The delivered antenna corresponds to the mobile module type from the equipment. Below is
presented an example of an omni directional magnetic antenna with its respective specifications.
Type: “magnetic base antenna”
Directivity: omni directional
Frequency: Multiple bands ( 890 to 960, 1710
to 1880, 1850 to 1990 MHz and 1920-2170
MHz)
Gain: 2 dbi
Polarization: vertical
Height: 72,5 mm total, 43mm active stick
Cable: RG174, length 2,5m
End connector: SME female
Magnetic base: diameter 2,8 cm
Figure 14 – Magnetic antenna
