11.3 External antenna
The external antenna is connected to the modem via SMA connector.
Antenna must have parameters as shown below in table.
Antenna frequency range Quad-band GSM 850/900/1800/1900 MHz or UMTS
900/2100 Mhz
Impedance 50 Ω
DC impedance 0 Ω
Gain 0 dBi w/o cable; 2dBi w/ cable
VSWR (with cable) -10 dB
The antenna chosen for working with modem should best fit to circumstances of
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 specific indoor antenna should be used
to increase it.
11.4 Environmental characteristic
Table below gives the environmental operating conditions of RB800 terminal.
Attention!
Exceeding the values may result in permanent damage to the module.
Parameter Conditions Min Max Unit
Ambient Operating
Temperature
-20 60 °C
Storage Temperature -40 85 °C
ESD At antenna connector
Contact
Air
At interface connector
± 6
± 15
± 1
KV
Humidity 5 85 %
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