Telit Wireless Solutions GM862-GPS Uživatelský manuál stáhnout pdf (Strana 47)

GM862-GPS Hardware User Guide

1vv0300728 Rev. 0 - 27/04/06

8 GPS Receiver

8.1 GPS Antenna

The GE863-GPS module is not provided with an internal LNA amplifier. The use of an active antenna

is suggested to achieve a good performance.

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

• Supply voltage referred to VBATT (mandatory a working range between 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 comma nds)

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

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

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Telit Wireless Solutions GM862-GPS Uživatelský manuál Strana 47