YK-88CN-1 - discontinued 270 Hz CW Filter for 8.83 MHz IF (non-EU) This model is discontinued Filters & 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