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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Trimming Elements
3.3.7. Trimming Elements
The location of the trimming elements on the A431 Module is shown in Figure 17.
Figure 17. Location of the trimming elements.
3.3.8. Adjusting the Receiver Front End
1. Mount the DUT (Device Under Test) on the testing fixture and connect it to the
host via the serial cable.
2. Select the appropriate instrument profile depending on the device’s band.
3. Turn the DUT in permanent receive mode by entering the RX command at the
terminal.
4. Adjust the FL1 and FL2 filters (see Figure 17) until you obtain a curve similar to
the one shown in Figure 18 (depending on the band, the markers may be
different); this is done by successively adjusting the five trimming screws
located on the filters.
R75 (Crystal Reference)
FL1FL2
L15 (RX VCO)
L7 (TX VCO)