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Sotabeams CW audio filter

Small, $35 audio filter has 100 Hz and 300 Hz band pass filters for CW with the uBitx or Bitx. It can also light a CW tune LED to help in precise tuning.

https://groups.io/g/BITX20/message/38710

filter https://www.sotabeams.co.uk/dual-bandwidth-filter-modules-ssb-cw/

Other:

VK4PLN board: https://groups.io/g/BITX20/topic/14920831