Manual

GE863 Hardware User Guide

1vv0300783 Rev.0 - 10/06/08

5.3 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.

5.4 GPS Antenna Requirements

The GE863-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 (Must accept values from 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)

5.4.1 Combined GPS Antenna

The use of combined GPS antennas is NOT recommended; this solution could generate an extremely

poor GPS reception and also the combination antenna requires additional diplexer and adds a loss in

the RF route.

5.4.2 Linear and Patch GPS Antenna

Using this type of antenna introduces at least 3 dB of loss if compared to a circularly polarized (CP)

antenna. Having a spherical gain response instead of a hemispherical gain response could aggravate

the multipath behaviour & create poor position accuracy.