The article details the technical journey of implementing Bell 202 AFSK demodulation for 1200 baud packet radio on embedded systems, focusing on the Goertzel algorithm as an efficient alternative to traditional FFT approaches. The author shares visualizations and insights that provide an intuitive understanding of DFT and Goertzel's algorithm in the context of radio communications. The content bridges practical implementation challenges with theoretical concepts in digital signal processing for amateur radio applications.
Background
Packet radio using AX.25 protocol with Bell 202 AFSK modulation is a legacy but still widely used method in amateur radio communications, particularly for its simplicity and reliability over long distances. The Goertzel algorithm is a digital signal processing technique that efficiently detects specific frequencies in a signal, making it ideal for resource-constrained embedded systems.
- Source
- Lobsters
- Published
- May 24, 2026 at 10:22 PM
- Score
- 6.0 / 10