PG-3B DC line noise filter Filters and Line Noise Filters KLF-2Line Noise FilterPG-3BDC line noise filterYF-107C500Hz CW Filter for TS-480HX/SATYF-107CN270Hz CW narrow filter for TS-480HX/SATYF-107SN1.8 kHz SSB narrow filter for TS-480HX/SAT