User's Manual
Table Of Contents
- 1. Introduction
- 2. Hardware
- 3. The A431 Radio Module
- 3.1. About the A431 Radio Module
- 3.2. Functional description
- 3.3. Manufacturing Issues
- 3.3.1. Marking and labeling issues
- 3.3.2. Alignment Range and Switching Range
- 3.3.3. Tuning Procedure
- 3.3.4. Setting Up the Default Parameters
- 3.3.5. Definitions
- 3.3.6. Test Equipment Settings
- 3.3.7. Trimming Elements
- 3.3.8. Adjusting the Receiver Front End
- 3.3.9. Adjusting the VCOs
- 3.3.10. Adjusting the Crystal Reference
- 3.3.11. Checking the Receiver Parameters
- 3.3.12. Checking the Transmitter Parameters
- 3.3.13. Data Transfer Check
- 3.6. Frequency Reference Specifications
- 3.7. A431 Module’s Photographs
- 4. Software
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Definitions
3.3.5. Definitions
The diagram of the setup environment is depicted in Figure 15.
Figure 15. Trimming Setup.
The testing fixture is used to fasten the A431 Module under test both mechanically
and electrically in such a way as to allow its rapid and comfortable alignment. It con-
sists of a mechanical board with two screws that are used to fasten the board; two
elastic pins are used to transport the relevant signals from the module to their cor-
responding test cables. The directional coupler connects the antenna input/output
of the device under test to both the network analyzer and the service monitor. The
schematic diagram of the testing fixture is depicted in Figure 16.
Figure 16. Schematic Diagram of the Testing Fixture.
0.765 V
Out
Scope
Ant I/O Out
Voltmeter
Out
Network
Analyzer
Testing
Fixture
RS232 To/From PC
+
–
6.5 V
A733MB
Connector
Optional
Scope Service Monitor Network Analyzer
Voltmeter
Directional Coupler
Scope
Out Network
Analyzer
Ant
Gnd
TP1
A733MB
TP2
TP2
Voltmeter
470KΩ
Antenna
A431
Module