Integration Guide
Table Of Contents
- Preface
- Contents
- 1 System description
- 1.1 Overview
- 1.2 Architecture
- 1.3 Pin-out
- 1.4 Operating modes
- 1.5 Power management
- 1.6 System functions
- 1.7 RF connection
- 1.8 SIM interface
- 1.9 Serial Communication
- 1.10 Audio
- 1.11 ADC input (LEON-G100 only)
- 1.12 General Purpose Input/Output (GPIO)
- 1.13 M2M Setup Schematic Example
- 1.14 Approvals
- 2 Design-In
- 3 Handling and soldering
- 4 Product Testing
- Appendix
- A Extra Features
- B Glossary
- Related documents
- Revision history
- Contact
LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-F3 Preliminary Design-In
Page 86 of 101
Furthermore, any other DC signal injected to the RF connection from ANT connector to radiating element will
alter the measurement and produce invalid results for antenna detection.
It is recommended to use an antenna with a built-in diagnostic resistor in the range from 5 kΩ to 30 kΩ to
assure good antenna detection functionality and to avoid a reduction of module RF performances.
For example: consider GSM antennas with built-in DC load resistor of 15 kΩ.
Using the +UANTR AT command, the module reports the resistance value evaluated from ANT pad to GND:
Reported values close to the used diagnostic resistor nominal value (i.e. values from 10 kΩ to 20 kΩ if a
15 kΩ diagnostic resistor is used) indicate that the antenna is connected
Values above the maximum measurement range limit (about 53 kΩ) indicate that the antenna is not
connected
Reported values below the minimum measurement range limit (about 1 kΩ) indicate that the antenna is
shorted to GND
Measurement inside the valid measurement range and outside the expected range may indicate an improper
connection, damaged antenna or wrong value of antenna load resistor for diagnostic