[RFI] Travel trailer converter RFI solutions

[nm8rmedic]

Has anyone on the forum succeeded in quieting the RFI from the AC to DC converter in their travel trailer?Or has anyone identified a suitable linear power supply with battery charging circuitry?Our trailer has a switching power converter rated at 55 amps. It produces RFI about every 30 khz, mainly in the 40 and 20 meter amateur bands. Powering down the converter kills them, so they are coming from the switching power supply that forms the basis of the converter.   Neither an Isobar filtering power strip, nor Mix 31 ferrite cores on the AC power cable had effect. The same cores on the DC line cause some odd ferromagnetic resonance inside the converter because it audibly growls when they are in place. Bypass capacitors on the DC line had no effect.I'm interested in hearing anyone's success story.ScottSent from my Verizon, Samsung Galaxy smartphone