"Larry Benko" wrote in message
...
I just happened upon an App. note written by Philips
Semiconductors (ECO6907) titled "Design of HF wideband power
transformers" which states for both 4:1 and 9:1 transmission
line transformers that they CAN be wound on a single core if
desired for certain conditions (see sections 6.3, 6.4 and 6.6).


http://www.semiconductors.philips.co...es/ECO6907.pdf

73,
Larry, W0QE

And, that comes in TWO parts. ECO6907 and ECO 7213. BOTH wonderful
resources, and both apply to the discussion here. (They DO call them
"conventional transformers" and not Baluns.)

W4ZCB