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10.3 External antenna
The external antenna is connected to the modem via a SMA connector.
The antenna must have parameters as shown below in the table.
Antenna frequency range
Impedance
DC impedance
Gain
VSWR (with cable)
The antenna chosen for working with the modem should best fit to the circumstances of
the environment it is used in. When the modem is placed in a room or somewhere where
the range of networks signal is too low, the outdoor or a suitable indoor antenna should be
used to boost the strength.
10.4 Environmental specification
The table below gives the environmental operating conditions of the RB600 terminal.
Attention!
Exceeding the values may result in permanent damage of the module.
Parameter
Ambient Operating
Temperature
Storage Temperature
ESD
Humidity
26
Dual-band GSM 900/1800 MHz
50 Ω
0 Ω
0 dBi w/o cable; 2dBi w/ cable
-10 dB
Conditions
At antenna connector
Contact
Air
At interface connector
Min
Max
-20
60
-40
85
± 6
± 15
± 1
5
85
Unit
°C
°C
KV
%
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