John,

No mystery - the stock K3/K3S includes the 2.7kHz filter or the 2.8kHz with the upgrade. So CW transmit has to work with that filter - the DSP does the rest.

So if you select a CW width filter for CW transmit, you will get the ERR TXF message.

73,
Don W3FPR

On 1/10/2019 5:52 PM, John Simmons wrote:
Interesting to note that CW transmit requires the SSB filter not the CW filter.

-John NI0K

Don Wilhelm wrote on 1/10/2019 4:47 PM:
I forgot to say that most modes will use the 2.7/2.8 kHz for transmit. The exceptions are AM and FM.
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