Owner's manual

GM862-GPS Hardware User Guide

1vv0300728 Rev. 8 - 20/09/07

4.2 GSM Antenna - Installation Guidelines

• Install the antenna in a place covered by the GSM signal.

• The Antenna must be installed to provide a separation distance of at least 20 cm from all persons

and must not be co-located or operating in conjunction with any other antenna or transmitter;

• Antenna shall not be installed inside metal cases

• Antenna shall be installed also according Antenna manufacturer instructions.

4.3 GPS Antenna Requirements

The GM862-GPS module is not provided with an internal LNA amplifier. The use of an active antenna

is important to achieve a good performance.

The module is provided of an Antenna supply circuit with the following characteristics:

• Supply voltage referred to VBATT (3.4 to 4.2 V DC)

• Supply enable controlled internally by the BB

• Current measurement circuit (readable also with AT commands)

• Voltage measurement circuit (readable also with AT commands)

• HW Protection for Antenna Short Circuit (if consumption exceeds 40mA)

The external active antenna for a Telit GM862-GPS device shall fulfill the following requirements:

ANTENNA REQUIREMENTS

Frequency range

1575.42 MHz (GPS L1)

Bandwidth

+- 1.023 MHz

Gain

1.5 dBi < Gain < 4.5 dBi

Impedance

50 ohm

Amplification

Typical 25dB (max 27dB)

Supply voltage

Must accept from 3 to 5 V DC

Current

consumption

Typical 20 mA (40 mA max)

Furthermore if the device is developed for the US market and/or Canada market, it shall comply to the

FCC and/or IC approval requirements:

This device is to be used only for mobile and fixed application.