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Chapter 1 – Product Overview
22 MultiModem rCell User Guide
EV-DO
Sleep Typical Maximum
9 volts
0.0465A, 2.27W 0.370A, 3.40W 0.780A, 7.13W
20 volts
0.125A, 2.50W 0.220A, 4.40W 0.374A, 7.48W
32 volts
0.238A, 7.62W 0.145A, 4.64W 0.385A, 7.62W
Note: Multi-Tech Systems, Inc. recommends that the customer incorporate a 10% buffer into their power source
when determining product load.
Cellular Information
Antenna System for Cellular Devices
The cellular/wireless performance depends 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 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.
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.
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