Technical 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
- 3.4. PCB Parts Placement
- 3.6. Frequency Reference Specifications
- 3.7. A431 Module’s Photographs
- 4. Software
31
Definitions
3.3.5. Definitions
The diagram of the setup environment is depicted in Figure 18.
Figure 18. 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 external coaxial switch or relay (Power/Sens. <–> Wob-
ble) allows switching of the antenna input/output to the network analyzer or to the
service monitor. The schematic diagram of the testing fixture is depicted in
Figure 19.
Figure 19. Schematic Diagram of the Testing Fixture.
0.765 V
Power/
Sens
Wobble
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
Scope
Out Network
Analyzer
Ant
Gnd
TP1
A733MB
TP2
TP2
Voltmeter
470KΩ
Antenna
A431
Module