I am having trouble relating Steve's photo of an air inductor filter with the world I live in.
I see something on the order 12 and 15 turns on the two coils. Not sure of the diameter or wire size but it is hard to understand how we can get 10's of uH out of these.
My 40 uH coil has about 50 turns of #18 enamel wire on .1" centers.
His are close spaced but with plastic insulation so they would come out about the same spacing.
The pics make it look like why bother with expensive cores but the 90 uH air version gets pretty serious as I see it.
The pics are a mystery that I ignored but going to higher power means I need one for the out put coil as the core I am using is not going to hack it.
Is there any reason that I can not close space #18 enamel wire (or any other size) for this application, i.e. 200W carrier?
Jack