User guide

Appendix B – Cellular Information
Multi-Tech Systems, Inc. MultiModem rCell User Guide 61
4BAppendix B - Cellular Information
Antenna System for Cellular Devices
The cellular/wireless performance is completely dependent on the implementation and antenna design. The integration
of the antenna system into the product is a critical part of the design process; therefore, it is essential to consider it
early so the performance is not compromised. If changes are made to the certified antenna system of the MultiModem,
then recertification will be required by specific network carriers such as Sprint. The Antenna System is defined as the
UFL connection point from the MultiModem to the specified cable specifications and specified antenna specifications.
FCC Requirements for the Antenna
The antenna gain, including cable loss, for the radio you are incorporating into your product design must not exceed
the requirements at 850 MHz and 1900 MHz as specified by the FCC grant for mobile operations and fixed mounted
operations as defined in 2.1091 and 1.1307 of the FCC rules for satisfying RF exposure compliance. The antenna used
for transmitting must be installed to provide a separation distance of at least 20cm from all persons and must not
transmit simultaneously with any other antenna transmitters. User and installers must be provided with antenna
installation instructions and transmitter operating conditions to satisfying RF exposure compliance.
Antenna Specifications
CDMA RF Specifications
CDMA 800
CDMA 1900
Frequency RX
869 to 894 MHz
1930 to 1990 MHz
Frequency TX
824 to 849 MHz
1850 to 1910 MHz
CDMA Antenna Requirements/Specifications
Frequency Range
824 – 894 MHz / 1850 – 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
The total radiated power (TRP) at the antenna shall be no less than
+21/20 dBm for PCS/CELL channels respectively, and the total isotropic
sensitivity (TIS) at the antenna shall be no less than -104/104 dBm for
PCS/CELL channels 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.
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