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Chapter 1 – Product Description and Specifications
RF Specifications
GSM 850 EGSM 900 GSM 1800 GSM 1900
Frequency RX 869 to 894 MHz 925 to 960 MHz 1805 to 1800 MHz 1930 to 1990 MHz
Frequency TX 824 to 849 MHz 880 to 915 MHz 1710 to 1785 MHz 1850 to 1910 MHz
RF Power Stand 2W at 12.5% duty
cycle
2W at 12.5% duty
cycle
1W at 12.5% duty
cycle
1W at 12.5% duty
cycle
Antenna Specifications
GSM/EGSM Antenna Requirements/Specifications
Frequency Range: 824 – 960 MHz / 1710 – 1990 MHz
Impedance: 50 Ohms
VSWR: <2.0:1
Typical Radiated Gain: 3 dBi on azimuth plane
Radiation: Omni
Polarization: Vertical
Wave: Half Wave Dipole
Antennas Available from Multi-Tech Systems, Inc.
Description Part Number
Hinged Right Angle 900/1800 MHz Cellular Modem Antenna ANF1-1HRA
Hinged Right Angle 800/1900 MHz Cellular Modem Antenna ANF2-1HRA
Hinged Right Angle 850/900/1800/1900 MHz Cellular Modem Antenna ANQB-1HRA
PTCRB Requirements Note
There cannot be any alteration to the authorized antenna system. The antenna system must be the
same type with similar in-band and out-of-ban radiation patterns and maintain the same specifications.
FCC Requirements Note
The antenna gain, including cable loss, must not exceed 3.0 dBi at 1900 MHz / 1.6 dBi at 850 MHz for
mobile operating configurations and 7.0 dBi at 1900 MHz / 2.3 dBi at 850 MHz for fixed mounted
operations, as defined in 2.1091 and 1.1307 of the rules for satisfying RF exposure compliance.
Interfaces
The wireless MultiModem has several interfaces:
● LED function indicating operating status
● External antenna (via SMA connector)
● Serial and control link (via USB connector)
● Microphone and speaker (via handset jack)
● SIM card holder
Multi-Tech Systems, Inc. MultiModem GPRS USB Wireless Modem User Guide 9