Kenwood Crystal Filters are available to install and upgrade the Kenwood TS-480SAT or TS-480HX transceivers.
Add the ability to practically eliminate interference from signals on adjacent frequencies in order to hear weaker signals.
Two filter slots in these radios allow you to choose two of the three available filters:
YF-107CN 270 Hz narrow CW
YF-107C 500 Hz standard CW
YF-107SN 1.8 kHz narrow SSB
Each have excellent shape factor so you can capture just what you want to hear.