On Feb 19, 12:49 pm, "N9NEO" wrote:
On Feb 18, 8:47 pm, HFguy wrote:

N9NEO wrote:
I have gotten some large 125mu binocular cores from the dumpster here
at work. If they are a good choice for your balun then I will make a
portion of them available to people here on this board for shipping
cost. The holes are about 1/4" with a LOT of ferrite around it.
Should only need I think 1:3 of small wire for a nice unit.

If somebody who knows more than me would like to make comment on a
good design then please do.

regards,
NEO

Do know anything about the ferrite material of these cores or what they
were used for?

Yes, Mu is 125 and they were used in a commercial HF 250w transmitter
final.

73
NEO

The cores are 1.2" x 1.2" x0.6" Holes are 0.25"