User's Manual
Table Of Contents
- 1 Overview
- 2 GE864-QUAD V2 Mechanical Dimensions
- 3 GE864-QUAD V2 module connections
- 4 Hardware Commands
- 5 Power Supply
- 6 Antenna
- 7 Logic level specifications
- 8 Serial Ports
- 9 Audio Section Overview
- 10 General Purpose I/O
- 10.1 GPIO Logic levels
- 10.2 Using a GPIO Pad as INPUT
- 10.3 Using a GPIO Pad as OUTPUT
- 10.4 Using the RF Transmission Control GPIO4
- 10.5 Using the RFTXMON Output GPIO5
- 10.6 Using the Alarm Output GPIO6
- 10.7 Using the Buzzer Output GPIO7
- 10.8 Indication of network service availability
- 10.9 RTC Bypass out
- 10.10 External SIM Holder Implementation
- 11 DAC and ADC section
- 12 Conformity Assessment Issues
- 14 Document Change Log
GE864-QUAD V2 Hardware User Guide
1vv0300841 Rev.0.1 24/11/09
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 29 of 65
This line of transmission shall fulfill the following requirements:
ANTENNA LINE ON PCB REQUIREMENTS
Impedance
50 ohm
Max Attenuation
0,3 dB
No coupling with other signals allowed
Cold End (Ground Plane) of antenna shall be equipotential to
the GE864-QUAD V2 ground pins
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. The antenna(s) used for this transmitter
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. End-Users must be
provided with transmitter operation conditions for satisfying RF exposure compliance. OEM integrators
must ensure that the end user has no manual instructions to remove or install the GE864-QUAD V2
module. Antennas used for this OEM module must not exceed 1.4dBi @900, 3dBi @1800, 1.4dBi
@850 and 3dBi @1900 gain for mobile and fixed operating configurations.
6.2 GSM Antenna - PCB line Guidelines
• Ensure that the antenna line impedance is 50 ohm;
• Keep the antenna line on the PCB as short as possible, since the antenna line loss shall be less
than 0,3 dB;
• Antenna line must have uniform characteristics, constant cross section, avoid meanders and
abrupt curves;
• Keep, if possible, one layer of the PCB used only for the Ground plane;
• Surround (on the sides, over and under) the antenna line on PCB with Ground, avoid having other
signal tracks facing directly the antenna line track;
• The ground around the antenna line on PCB has to be strictly connected to the Ground Plane by
placing vias once per 2mm at least;
• Place EM noisy devices as far as possible from GE864-QUAD V2 antenna line;
• Keep the antenna line far away from the GE864-QUAD V2 power supply lines;
• If you have EM noisy devices around the PCB hosting the GE864-QUAD V2, such as fast
switching ICs, take care of the shielding of the antenna line by burying it inside the layers of PCB
and surround it with Ground planes, or shield it with a metal frame cover.
• If you don't have EM noisy devices around the PCB of GE864-QUAD V2, by using a strip-line on
the superficial copper layer for the antenna line, the line attenuation will be lower than a buried
one;