Hi,
I wound a test inductor using litz wire and a ferrite core, one layer of wire on the bobbin, now I realize there is still enough room for adding another layer of wire. I would like to keep the same number of turns, is it ok to wind the next layer on top of the first, in parallel with the first layer? The reason I ask is the second layer will have a wider loop of copper, and thus a longer path length of wire, so if I attach the ends of the first and second layer in parallel, the DC resistance of the outer layer will be higher, so I don't know if this will cause a lower Q in the inductor. The other option is wind two strands at once and then make a second layer with these, but that requires insulation between the first and second layers.
cheers, Jamie