[Elecraft] Elecraft KAT500 when powered up generates noise in RX

[Brian Hemmis]

I searched online but couldn’t find an answer to this. Perhaps someone in the group has a suggestion. 
When powering up the KAT500 tuner (used with KPA500) the static level on my Icom 7300 raises to as much as 7 S units of a pulsing ignition-like sounding noise. At first I thought it was a noisy wall wart but tried several and no difference. Then wired it directly to my Astron supply with the same noisy results. The problem is worse on 6 meters but still apparent on the lower bands.
Any thoughts on a fix for this ?
73, Brian K3USC