[TowerTalk] High power 2:1 transformer was Re: 16om vertical and the number of radials

[Richard (Rick) Karlquist]

I'm not sure what your question is.
Do you want to compare how an UNUN is
constructed differently than a BALUN?
Or are you asking about my homebrew UNUN?

Any 50 to 22.2 ohm UNUN will basically consist
of a trifilar winding with the three filars
connected in series.  My homebrew UNUN
consists of a bifilar winding of coax.  The
shields of the two coax runs are tied together.
This effectively gives 3 filars: the two center
conductors, plus the paralleled shields.
Coax gives me closer coupling than I could get
with wire twisted together.

An UNUN gives you more bandwidth than the
popular L-C network

Rick N6RK

On 12/2/2022 4:58 PM, john at kk9a.com wrote:
> How is the construction different?
> 
> John KK9A
> 
> 
> Richard (Rick) N6RK wrote:
> 
> Wrong device.  You want an "UNUN" not a "BALUN".
> A vertical antenna is unbalanced.
> 
> I have an UNUN built with RG-58 coax wound around
> a 2.4 inch #33 ferrite core. Very easy to make.
> 
> Rick N6RK
> 
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