Welcome aboard.
I haven't had any noise issues from the converter. Had one LED light that spewed some junk but it failed in short order. Are you running the rig off coach 12 VDC? I usually run my Kenwood TS570 off either a car battery or an Astron M35 power supply. No noise problems.
I have at one time or another on my ham radio career put ferrite chunks on just about everything.