SCAF External CW Filter Full Kit
Building the “Toothpick” Audio CW Filter – HAMRADIO
Four State QRP Group
ElectroResales Active CW Filter centered at 600 Hz | eBay
VEC-841KC, KIT CASE, TUNABLE CW AUDIO FILTER | MFJ Enterprises Inc
Filter kit suitable for CAT CB 224 C w/HATZ Eng. Air Oil Fuel | eBay
20m 30m 40m CW SSB Low-pass Filter LPF Board DIY Kit / Finished Low-pass Filter | eBay
ElectroResales Active CW Filter KIT Filter is centered at 600 Hz | eBay
Crystal Filter Design - Land Boards Wiki
Filter kit suitable for CAT V 40 C w/Perkins Eng. Air Oil Fuel | eBay
Filter kit suitable for CAT D 350 C w/CAT Eng. Air Oil Fuel | eBay
Filter Kit Suitable for Cat CB 214 C w/Hatz Eng | eBay
OP Amp based CW audio filter kit | Another Electronics Blog
Easy Bandpass Filter - Pacific Antenna
QRPGuys Active 600Hz Audio Filter - QRPGuys
Truck Oil/Fuel Filter Kit for UD GE13TB/D 13.1L CW GW GK FK030 Donaldson X903237 | eBay
The Rugster” – A Simple 40M DC CW RX Using the NM0S Hi-Per-Mite Filter From 4SQRP – Dave Richards AA7EE
20m 30m 40m CW SSB Low-pass Filter LPF Board DIY Kit / Finished Low-pass Filter | eBay
K4ICY's Home Brew CW Audio Filter
VEC-820KC, KIT CASE SUPER CW AUDIO FILTER | MFJ Enterprises Inc
VEC-820KC, KIT CASE SUPER CW AUDIO FILTER | MFJ Enterprises Inc
VEC-820K, KIT, SUPER CW AUDIO FILTER | MFJ Enterprises Inc
VEC-821K, KIT, SUPER CW FILTER WITH AMP | MFJ Enterprises Inc
Hi-Per-Mite | Q R P e r
