User guide

Appendix B – Cellular Information
MultiModem Cell User Guide 37
GSM/EGSM RF Specifications
GSM 850
EGSM 900
GSM 1800
GSM 1900
Frequency RX
869 to 894 MHz
925 to 960 MHz
1805 to 1880 MHz
1930 to 1990 MHz
Frequency TX
824 to 849 MHz
880 to 915 MHz
1710 to 1785 MHz
1850 to 1910 MHz
GSM Antenna Requirements/Specifications
Frequency Range
824 – 960 MHz / 1710 – 1990 MHz
Impedance
50 Ohms
VSWR
VSWR shall not exceed 2.0:1 at any point across the bands of
operation
Typical Radiated Gain
3 dBi on azimuth plane
Radiation
Omni-directional
Polarization
Vertical
Antenna Loss
Free space not to exceed -3db
TRP/TIS
Including cable loss the total radiate power (TRP) at the antenna
shall be no less than +22/24.5 dBm for 850/1900 MHz
respectively, and the total isotropic sensitivity (TIS) at the antenna
shall be no less than -99/101.5 dBm for 850/1900 MHz
respectively.
PTCRB Requirements for the Antenna
There cannot be any alteration to the authorized antenna system. The antenna system must maintain the same
specifications. The antenna must be the same type, with similar in-band and out-of-band radiation patterns.