I have been trying to use a mini wire-wound air core SM inductor (100nH - digikey 732-1820-1-ND) as a component to match stages of a nominal 100MHz amplifier (not actually for radio use) and I found it simply didn't perform at all: but when I replaced it with a hand-made coil (4 tight turns of number 20 on 0.25" diameter) everything worked perfectly.
Please explain why?
Please explain why?