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Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem GPRS Wireless Modem User Guide 7
Electrical Characteristics
Electrical Characteristics
Switching the GSM modem on/off The device is permanently powered (when connected to the power
supply).
Voltage Range Voltage range : 5 to 32V DC
GND : 0V
Over voltage and Under voltage Correct operation of the Wireless MultiModem in communication mode is
not guaranteed if input voltage falls below 5V.
Input/output electrical characteristics for external connections
Parameters
GSM/GPRS 850/900 GSM/GPRS 1800/1900
Typ. Typ.
Unit
Input Supply Voltage 5 13.2 32 5 13.2 32 V
Input peak supply current in comm. mode at P
max
1 .4 .2 1 .4 .2 A
Input average supply current in comm. mode at
P
max
360 150 75 300 125 70 mA
Input average supply current in idle mode 30 10 10 30 10 10 mA
Antenna/RF Specifications
GSM 850 EGSM 900
Frequency RX
869 to 894 MHz 925 to 960 MHz
Frequency TX
824 to 849 MHz 880 to 915 MHz
RF Power Stand
2W at 12.5% duty cycle 2W at 12.5% duty cycle
Impedance
50 ohms
VSWR
<2
Typical Radiated Gain
0 dBi on azimuth plane
GSM 1800 GSM 1900
Frequency RX
1805 to 1880 MHz 1930 to 1990 MHz
Frequency TX
1710 to 1785 MHz 1850 to 1910 MHz
RF Power Stand
1W at 12.5% duty cycle 1W at 12.5% duty cycle
Impedance
50 ohms
VSWR
<2
Typical Radiated Gain
0 dBi on azimuth plane