[TowerTalk] Balun Construction help

[RCARIELLO]

Hello to all,
I am looking for construction details on a:

25 ohm balanced to 50 ohm unbalanced toroidal balun.
Power range 2000 watts.
Frequency range 3.5 to 4 MHz.

also a:

12.5 ohm balanced to 50 ohm unbalanced toroidal balun.
Power range 2000 watts.
Frequency range 3.5 to 4 MHz.


Thanks in advance

Rich AA2MF