> 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
You don't need no stinkin' ferites.
Just wind about 6 turns of copper tubing coil, insert it between the base of
the whip and ground, connect coax - shield to ground and center - find 50 ohm
point on the coil, about 3 - 4 turns up.
73 Yuri, K3BU/m
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