"Brian" wrote in message
nk.net...
I was wondering if the toroid I was going to bust out of an old broken icf
2001 would work for the 9:1 matching transformer I was building. And does
anyone know how to wind a toroid with two holes?

Brian

Don't know what an ICF2001 is, but what you are describing is a binocular
core- these make a FAR superior 9:1 than do classic toroidal cores. 1.5:1
VSWR BW will be nearly 10X wider with a binocular core than toroidal.
In a binocular core 1 turn is counted when the wire traverses each hole 1X.
Dale W4OP