I have been told by at least two other stations that I have an intermittent 2.5 khz (minimum) noise pedestal on CW. Sounds like key clicks according to them, but a bit different. Without hearing it myself, it is difficult to describe. The issue is intermittent, they will hear it for a while and it will then be gone.
I am running the K3s. I key with a bug. I have the KPA 1500. The noise is heard with strong signals, although I dropped to barefoot this morning and the listener said he could still tell they were there.
At first, we thought an RFI issue. But, if running barefoot, not likely.