Topband: Wideband x-former...

[Lars Harlin]

Hi TB'ers!

Anyone out there with experiences on wideband transformers wich can handle some power?
I've been trying to match 20 ohms to 50 ohms for a mobile whip, but no success so far...

I've tried different cores, iron powder and ferrites, separate windings and one tapped winding, but cant make it work. My hypothesis is that a 2:1 impedance conversion would do, so then the relation between the two windings should be the square root of 2 ie 1,414. What am I missing?

All suggestions welcome!

73 de Lars, SM3BDZ