User guide

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Chapter 1 – Introduction and Description

Multi-Tech Systems, Inc. MultiModem rCell User Guide 9

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.

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.

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.

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

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.

GSM Antenna Requirements/Specifications