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
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2. Hardware
2.1. Overview
Most of the electronics (including the A431 radio module) are situated on the main
board (for the A431 description, see “The A431 Radio Module” on page 25). The
main board (Figure 1) contains the radio unit, a low-speed modem interface, a mi-
crocontroller and a power management subsystem. For the analog inputs and the
digital inputs/outputs, two identical interface boards (A733CA) holding the 7-pin
Binder connectors are used. The serial line and the power are provided on a 5-pin
Binder connector, while the antenna is fed through a 50
Ω
BNC connector.
Figure 1.
A733 Block Diagram.
A431 Radio
Antenna
µController
Modem
Interface
Power
Management
System Supply
Battery
External Power
ADC
12
8
Analog Inputs
Digital I/O
3 V CMOS
Interface
Module
Serial