"John Smith" wrote in message
...
You are thinking power xfrmr, where an isolation xfrmr is isolating from
ground loops, or possibly even dc.
A 1:1 unun is isolating from rf, the "choke" is implied!


we-yell ah reckon the only time I ever heard of - or seen one of dem-there
isolation transformers was in the context of power xfmrs. They were usually
shielded as well. The applications were usually 'computer-rooms'.

Wonder if we could use a 240 primary to 120v secondary as a 4-to-1 balun ?