Topband: Unun on FT-240-61

[Björn Mohr]

Hi Gang!

I am about to make an unun for my top loaded topband vertical using a
FT-240-61 core. I need a 2:1 ratio as the antenna has around 25 ohms feed
point impedance using two elevated radials. I have tried to google up
specifics, but have not found a conclusive suggestion for the number of
turns needed. I've seen references from 5-13 turns mentioned. Anyone has a
more precise suggestion or description, feel free to enlighten me on or off
list...

73 & Merry Christmas,

Björn /SM0MDG