Got it - it was worth dragging the desk out from the wall (no small
undertaking) so I could change the BNC cable from the K3 to the P3 with
an old mil-spec cable from my radar days.
With the replacement cable in place, all the ghosts vanished.
I have sent an email to support with the information and request for a
replacement cable.
Thanks to all who replied - the ghost spikes really did bug me, but I
was about to give up on it.
Bill W2BLC
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