My amateur radio operations has been spoilt by a very noisy PSU. This raised the noise floor by several S points.
I have tried to fit ferrites to the lead with limited success. I also couldn't find a large enough one for the mains lead. However, I suddenly realised I could strip the outer back and therefore wind several turns on two ferrites. This reduced the noise down to below one S point.
I must point out this should only be done by someone who understands the risk.
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