User guide
Table Of Contents
- Chapter 1 – Product Description and Specifications
- Product Description
- Related Documentation
- Safety
- General Safety
- The modem is designed for and intended to be used in fixed and mobile applications. Fixed means the device is physically secured at one location and cannot be easily moved to another location. Mobile means the device is used in other than fixed locati...
- RF Safety
- Vehicle Safety
- Device Maintenance
- Handling Precautions
- Front Panel Overview
- Package Contents
- Specifications
- Chapter 2 – Activating and Installing the Modem
- Chapter 3 – Using the Wireless Modem
- Appendix A – Regulatory Compliance
- Appendix B - Cellular Information
- Appendix C – Environmental Information
Multi-Tech Systems, Inc. MultiModem Cell User Guide 21
Antenna System for Cellular Devices
Wireless performance depends on 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
performance is not compromised. If you make changes to the certified antenna system of the MultiModem,
then recertification is 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/EVDO 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
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.