[TowerTalk] Balun power ratings

[Dave_Richardson]

Hi all
I want to construct a 4:1 HF Balun from readily available materials. I have the 14AWG EC wire and some ferrite rods of the sort used in MW BC radios.
There's plenty of info in the ham literature covering the constructional of such a beast but I cant find any advice as to what determines the max RF power handling capability.
I should think the size of wire proposed would be adequate for ham powers and I read that the 2 bifiler wires must be as closely coupled as possible. I guess the size and composition of the ferrite rod has an influence on the freq coverage but wonder how much it effects power handling?
Any advice gratefully received.
73 Dave G4GED