Key clicks can be generated by several different mechanisms within the receiver itself. Paradoxically, it's easier to produce false clicks with a high performance receiver than it is with a lesser receiver.
These have nothing to do with the transmitted signal. The first line of "defense" is to turn off the Preamp and turn on the Attenuator to reduce the overall strength of the signals. Next is to set the AGC to "Slow" to ensure a strong signal isn't within the roofing filter bandpass and triggering the AGC while the variable DSP filter is set narrow so the beat note isn't heard. In some cases using the RF gain to control the level helps a great deal. Another approach is to use a narrower roofing filter or to shift your bandpass so the edge of the roofing filter is very close to the desired signal on the side toward the interfering station and as far from the interfering station as possible. Shifting the bandpass may require you open up your DSP bandwidth to continue to hear the desired signal or shifting the DSP filter position within the roofing filter bandpass. And, remember, "clicks" are an essential component of a CW signal. They are the sidebands created by modulating (keying) the signal. Very careful shaping of the keying envelope, such as used in the K2 and K3, can minimize clicks while maintaining an easily readable signal, but the only way to completely eliminate clicks is to not key the signal at all. With a really high-performance you can snuggle up very close to a signal, as many here have noted. When you do that, you're much more likely to hear the essential clicks required for good keying. Ron AC7AC
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