Taming a switching supply?
I've been comparing an external 5V USB battery versus assorted wall warts, to get a sense of the extra noise introduced by assorted 5V switching supplies. There are definite differences, mainly at the low end below1 MHz. I wonder if something as basic as a large capacitor (such as a 1F super capacitor) placed across the 5V supply outlet would suppress the extra RF noise. Or is it still necessary to use a(n) inductor(s) in combination with a capacitor to truly "tame" a switching supply? And yes, I realize that I shouldn't be using a switching supply to power a KiwiSDR.