I think you guys figured it out. It is 0.43 outside diameter and looking up RG-225/U yields the same cable that I have. The cable I have has absolutely no markings on it. The only reason I know it was made by Amphenol is because there was a ribbon on the spool saying "Amphenol Electronics Corporation" on it. It has a single layer of outer woven braid from what I can tell.?
