Daniel wrote:
Hi to everyone,
i need to replace my 1:1 balun on my yagi tribander 14-21-28 Mhz. I
have in my stuff a toroid FT 240-61 and some pieces of rg-142 coaxial
cable. Anyone can help me to know how many winding needs on toroid to
achieve good reactance on 14 to 28 Mhz ?
Thank you ,
Daniel.

I used a dozen turns of RG58 on the same core, and achieved XL ~= 200 ohms
at 14MHz for a Cushcraft A3. RG142 is about the same OD, so you should be
able to fit that many turns on the toroid. If you want more XL, stack two
(or more) toroids.

Bryan WA7PRC