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
15
External Power Supply
when the battery voltage drops below 5.6 Volts, and under 5.9 Volts the RF opera-
tion may stop.
Figure 4.
Connection of an external power supply.
2.2. Specifications
The A733 fulfills the specifications of the EN 300 220-1, Class 12, ETS 300 086 and
ETS 300 113, as well as the FCC Part 90.214 (Subpart J) of the CFR 47.
Note: The parameters below were measured with the A733 + A431 combination.
Parameter Min Typ Max Unit
Common
Supply 5.6 6.2 10.0 V
Operating Temperature -30 +70 °C
Relative Humidity 99 %
Class Protection IP65
Data Rate (Using the On-board Software Modem) 1000 1500
a
2000 bps
Operating Frequency (-44 version)
b
430 450 MHz
Operating Frequency (-46 version)
b
450 470 MHz
Frequency Stability (-20 to +50°C) ±1.5 kHz
Frequency Stability (-30 to +60°C) ±2.5 kHz
Receiver
Sensitivity (12 db S/S+N) -118 dBm
Image Frequency Attenuation (1st IF = 45 MHz) -70 dB
POWER
I/O C
I/O D
+
-
Black
Red
5 to 10 Volt
RS232
+
+
Power Cable Serial Adapter Cable
I/O A
I/O B
ANT