Telit Wireless Solutions GM862-GPS - Manual (Page 47)

GM862-GPS Hardware User Guide
1vv0300728 Rev. 0 - 27/04/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 47 of 55
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 commands)
• 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