[Elecraft] K3 Transmit CW waveform

[k2av]

>From the K3 setup in manual pdf posted on the website:

"Rotate VFO A to select a CW transmit filter
(2.7 or 2.8 kHz). Note: Key clicks may result if
a narrower filter is selected for CW transmit."

This seems counter-intuitive. The intuitive guess would be a narrower filter
simply reduces the bandwidth of the transmitted signal, including making
leading and trailing edges "softer" and less liable to "click".  How does a
narrow filter generate clicks?

73, Guy
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