I would still put the converter in a proper Farady cage. A copper screen, (like a window screen but frankly for all but UHF you can have fairly large holes) all six sides, with condenser/capacitors on all wires going in and out, Ground the cage to the same ground as your radio.. ARRL showed a cheap TV suffering from TVI from their multi-kilowatts.. And what happened when they caged it.
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