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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Tuning Procedure
Consequently, two test reports will be provided to Adcon Telemetry AG.
For North America (FCC), only the portion 460 to 470 MHz will be used; therefore,
a single device model A440-46 having the switching range between 460 and 470
MHz will be submitted for testing.
3.3.3. Tuning Procedure
The A431 modules are to be tuned by mounting them on a test fixture consisting of
a specially modified A733 motherboard (the A733 is an universal low cost Remote
Telemetry Unit manufactured by Adcon). The modification refers to certain mechan-
ical aspects, in order to provide an easy plug in and out of the control connector (P2)
as well as to the TP1 and TP2 test points.
The alignment operation must differentiate between following classes of units:
• Band 1: from 430 to 440 MHz
• Band 2: from 440 to 450 MHz
• Band 3: from 450 to 460 MHz
• Band 4: from 460 to 470 MHz
Note: The boards differ only through the FL1 and FL2, in that Band 1 and 2 use
models TOKO 493S-1071A and 492S-1056A while Band 3 and 4 use models
TOKO 493S-1075A and 492S-1060A, respectively. In addition, the tuning pro-
cedure and some software parameters differ. The differences are clearly stat-
ed in the following paragraphs, where applicable.
Note: Special versions could also be delivered having switching ranges in-between
those defined above; however, it may never exceed 10 MHz.
3.3.4. Setting Up the Default Parameters
The tuning procedure is not possible without first configuring some default param-
eters for the A733 motherboard used in the testing fixture. This is done via the serial
interface of the motherboard by using a communication terminal program (e.g. Hy-
perterminal, in Microsoft® Windows™ 95). The terminal program must be config-
ured as follows:
• 19200 Baud
• 1 Stop bit
• No parity
• No protocol (neither hardware, nor software)
To check if the communication is operational, press the
ENTER key. An
nnnn 0
RxD
TxD
Ground
Battery
Ext Power
1
2
3
4
5