There may also be algorithm issues with the keyer in the stock firmware.
Updated firmware from Jim Sheldon or Ian Lee as posted to this group could help.
Or use an external electronic keyer.
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On Thu, Feb 22, 2018 at 12:47 pm, Nik VK4PLN wrote:
Change the CW key to using D0 and D1. You will need to add header pins and modify code...
73, VK4PLN
