On 1/25/2012 12:00 PM, RLVZ at aol.com wrote: > I have a W2FMI 25 to 50 ohm UNUN Transformer. (1 to 2 ratio) > > Could I use this same UNUN to temporarily match 50 to 100 ohms? (same 1 > to 2 ratio) Yes, to the extent that the stray C associated with that number of turns on that particular core doesn't cause a problem. 73, Jim K9YC