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That might be inducted, do you have any clamp-on ferrites??? Or some FT50-43s you can loop the supply lines through a couple of times?

Even higher type maybe 77 to get more inductance...or a series trap across the power leads and etc.

At 07:39 AM 6/1/2020, you wrote:

Both supplies cause BCI from strong local AM station on 700 kHz.? Battery supplies don't cause BCI

Chuck, W5USJ (ex K2OFN)
ARCI 5422, SKCC 19956
EM22cv, Rains Co., Texas
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Chuck, W5USJ