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CW Keyer

POTACAT includes a built-in CW keyer for FlexRadio users with a MIDI paddle (e.g. HaliKey).

Setup:

  1. Enable CW Keyer in Settings → CW Keyer
  2. Select your Keyer Mode: Iambic B, Iambic A, or Straight key
  3. Set your Speed (WPM)
  4. Click Refresh to detect MIDI devices, then select yours
  5. Use the Learn buttons to map dit and dah MIDI notes from your paddle
  6. Enable Local sidetone and adjust pitch/volume

How it works: POTACAT reads MIDI paddle events via the Web MIDI API, runs an Iambic keyer state machine, and sends cw key commands directly to your FlexRadio via the SmartSDR TCP API. This preserves your exact fist timing — no buffering.

CW status: The CW pill in the status bar shows keyer state. Click it for a popover with volume and WPM controls. The sidetone requires one click anywhere in the app to unlock (browser audio policy).