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Subject: Wireless Modem Design - Troubleshooting Guide

The purpose of this application note is to provide a systematic method for troubleshooting wireless modem designs, from the perspective of the CML Microcircuits’ modem IC.
Hardware problems commonly encountered in wireless designs with CML products will be discussed.
Detailed treatment of RF and microcontroller issues is beyond the scope of this application note and will not be covered.
[application note link].

Publication: AN/W_Data/Design/1 January 2003.

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Subject: MX429A Error Detection and Correction of MPT1327 Formatted Messages

This document gives algorithms for:

• Generation of the check bits of a transmitted codeword
• Received codeword error detection
• Limited error correction of a received codeword

These algorithms may be used with any bit or byte oriented modem, such as the MX429A or MX809, although the MX429A and MX809 devices can perform check bit generation and error detection automatically and the MX429A also provides a 16-bit ‘Syndrome’ output which may be used to aid error correction.
[application note link].

Publication: # 20830066.002.

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Subject: FX919B and FX929B Fade Management and 'A' Version Compatibility

This application note is to be read in conjunction with the current FX919B and FX929B Data Sheets.
This document is issued to clarify points in currently published documents and to present new information that will enable the user to easily understand and implement this 4-Level FSK product.
[application note link].

Publication: AN/Data/9x9B/1 December 1997.

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Subject: GMSK and 4-Level FSK Increasing Data Throughput in a Radio Telemetry System

This application note is to be read in conjunction with the current FX919B and FX929B Data Sheets.
This document is issued to clarify points in currently published documents and to present new information that will enable the user to easily understand and implement this 4-Level FSK product.
[application note link].

Publication: AN/Data/Gen/1 November 1997.

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Other Relevant Application Notes

• CMX589A Using Two-Point Modulation to Reduce Synthesiser Problems - [application note link]
• FX589: GMSK modem applications - [application note link]
• MX589: Practical GMSK Data Transmission - [application note link]
• FX909A: Signal Acquisition Principles - [application note link]
• CML Oscillators CML On-chip Oscillators - Configuration Information - [application note link]
• Switched Capacitor Interfacing: Anti-aliasing and Smoothing Filters - [application note link]