Do-it-yourself



My cables to connect my radio and the antenna I make them by myself...
read more about cables and connectors

To provide as long as possible 13.5V for my FT817...
read more about my Step Up Module

To suppress the subaudio tone in the headphone or loudspeaker I experiment with a Sallan-Key High-pass filter...
read more about my high-pass filter

How to build a manual antenna tuner...
read more ...

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Homebrew RF Circuit Design Ideas

Micro Controller Units
DIY DSP audio filter
RasPi & Ham Radio