Articles update in progress. All articles and project files should be updated by January 31th 2025.
![Passive CW Audio Filter - 600Hz / 800Hz Fig. 5 - 600Hz / 800Hz CW Audio Filter Prototype](https://dxexplorer.com/wp-content/uploads/2024/05/600Hz-800Hz-CW-Audio-Filter-768x560.jpg)
For amateur radio operators, accessories sometimes are as important as the radio gear. Browse to the radio accessories I built so far and I found most useful.