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What can I use a 13.8 V 20 A linear supply for?

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Wallace Gasiewicz:
While I agree with radiolistener, there are Ham radios that come with their own PS that work quite well. Of course the spurious signals of the PS are outside of any critical frequency and the specific PS for specific Ham radios are typically very good for switchers. Also the radios themselves have amazing noise filters that probably were not as necessary in the past.     

If you wish to see the radio waves given off by a switcher, put an antenna near it and attach the antenna to your spectrum analyzer.     

Of course there are also all sorts of spurious signals running loose in today's radio environment.  From computers, wifi and ethernet and all the wall worts etc....so the additional noise from another switcher may not be significant ( if they are good switchers), although I have had a few switchers that made radio listening very troublesome. They also can grossly affect any RF measurements if you are doing any RF analysis while trying to fix something.

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