Pirate Nation Radio
Rollin' Your Own Lowpass Filter

Lowpass Filter Details

The lowpass filter design is from Radio Free Berkeley

The lowpass filter is built into a used 2.25X4.25X1.25 inch metal enclosure with SO-239 coax connectors for input and output. I used a dremel tool to make the pc board but you could easily use a file to scape off the copper bewteen the sections. The coils were made using a drill bit as a form. If you can't find 51pf capacitors, combine a 47pf and a 4pf. Keep all the leads short. - DJ Pirate Joe