KitsAndParts.Com W3NQN Filter Kit 24 Toroids $66 includes the following toroids ONLY: 2 ea T106-0 2 ea T130-0 4 ea T130-6 16 ea T130-17 Transmit Band-Pass Filter LINKS "Multi-band TX BPF Project" by 5B4AGN (pdf 627.4 KB) "100 W - Bandpassfilter nach W3NQN" by DL2NBU (pdf 706.7 KB) [German/Deutsch] "Clean Up Your Signals with Band-Pass Filters" by W3NQN (pdf 218.9 KB KB) "Receiver Band-Pass Filters Having Maximum Attenuation in Adjacent Bands" by W3NQN (pdf 342.8 KB)