On May 9, 7:33 pm, wrote:
I hate switch mode power supplies.
I hate wall warts.
And I really really hate switch mode wall wart power supplies.
Linear wall warts are bad enough.

Found this while looking for a better (as in active) RFI probe.
http://www.arrl.org/tis/info/cable-modems.html

Switching-type AC adapters are indeed a disaster, at least as far as
shortwave (or MW) radios go.

But a good regulated and filtered "wall-wart" AC adapter has an
advantage over an internal power supply that is little noted: as the
voltage supplied to the radio by the adapter is very low, the owner
can work on the inside of the radio while the radio is operating with
no danger of a high voltage shock.

There are pros and cons to everything.

Best,

Joe