With so many people claiming that Switching Power supplies will interfere with your amateur Radio operations period, the results might be a bit surprising.
The link is https://youtu.be/R8p5WUAriBo
People can also check out my video on interfacing SmartSDR and fldigi for digital operations on my channel.
HOWEVER you were using one of the much better quality switchers that had a tunable noise control.
MOST Switchers are much cheaper and poorer quality (MFJ?) and do in fact generate a heck of a lot of unwanted RFI
So categorically saying Switchers are OK is plainly wrong.. Stating as you correctly stated that one you tested is good is the correct observation but one cannot generalize this to all Switchers
Unfortunately most hams are cheap ..so they end up with cheap noisy switchers and then complain that their radios hear too much noise..
Hence I still recommend using a linear power supply or battery just to avoid these issues...
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