Topband: 1:2 UNUN

[Tree]

1/4 wavelength of 75 / 2 = 37.5 Ohms

Will take your 28 ohms very close to 50.

On Mon, Jan 17, 2022 at 8:47 AM Kenny Silverman <kenny.k2kw at gmail.com>
wrote:

> Thanks Frank. Are these 1/4 wl lines?  And are T-connectors OK?
>
> Regards , Kenny K2KW
>
> > On Jan 17, 2022, at 11:29 AM, Frank W3LPL <donovanf at starpower.net>
> wrote:
> >
> > Hi Kenny,
> >
> > A very workable alternative is to use two lengths of 75 ohm coax
> > in parallel.  RG-11 is the best choice, but two lengths of RG-6
> > will also work. No need to coil it up, simply use it as part
> > of your transmission line from your antenna base to your station.
> >
> > 73
> > Frank
> > W3LPL
> >
> > ----- Original Message -----
> > From: "Kenneth Silverman" <kenny.k2kw at gmail.com>
> > To: "topband" <topband at contesting.com>
> > Sent: Monday, January 17, 2022 2:18:30 PM
> > Subject: Topband: 1:2 UNUN
> >
> > Does anyone have a drawing on how to wind a 1500w 1:2 UNUN?  And what
> type of core is needed?
> >
> > This is for my 160m vertical which is about 28 ohms.
> >
> > Regards , Kenny K2KW
> > _________________
> > Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
>