[TowerTalk] unun transformer design

[Jim Lux]

I'm looking for pointers at designing a broad band (3-30 MHz) phase 
reversing transformer, that can handle several hundred watts.  It 
doesn't have to be perfect. It's working into around 30-100 ohms.

I've got all the standard design equations, so what I'm looking for 
is practical advice on kinds of toroids have worked for folks in the 
past (size, material).

JIm