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Figure 15: Antenna interface
6.4.2 Antenna specifications
The antenna is a very important component in the system. Since the antenna transmits and receives
electromagnetic signal, and its efficiency depends on the antenna’s type, placement and the environment of the
antenna operating.
The recommended antenna specifications are showed in Table 12:
Table 12: antenna specifications
Frequency range GSM 850/900/1800/1900MHz
Impedance 50 ohm
Input power > 33dBm (2W) peak power in
GSM
VSWR recommended ≤2:1
VSWR absolute max ≤10:1
Gain ≤3dBi
6.4.3 Antenna placement
The antenna performance is very easily influenced by other electronic devices
. So the antenna placement should
be considered carefully as follow.
1. Place away from other electronic devices or other antennas.
2. Place far away from metal material.
3. Face the base station antenna directly if the signal strength is very weak.
T900_User Guide_V1.02 22 2013-05-22
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