Topband: Two 2:1 transformers to choose from!!

[Charlie Cunningham]

As I recall, when I wound the tranformer for my 40' X 10' KAZ terminated
loop, I wound it 3:13 T because I was trying to match from 50 ohms up to
around 950 ohms. The core I used was binocular that I cobbled together by
taping together two Fair-Rite tubular cores, side-by-side. I used wire-wrap
wire. Worked really well, and surely  helped me on 160 and 80m, but it was a
great receive antenna for 40 and 30m as well.

73,
Charlie, K4OTV

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Mike
Waters
Sent: Saturday, August 24, 2013 6:00 PM
To: topband
Subject: Re: Topband: Two 2:1 transformers to choose from!!

All those turns are better for what? For the winding that's connected to
the coax (either 50 or 75 ohms), two turns is plenty.

And good luck stuffing all that wire inside the holes in those binocular
cores, especially if you use the recommended protective insulating liner.
:-)

73, Mike
www.w0btu.com

On Sat, Aug 24, 2013 at 4:27 PM, Jim GM <jim.gmforum at gmail.com> wrote:

> So the general concessions is that 7:5 turns was better.  Do is 15:7 turns
> or 21:10 turns better? Whats best for 160M ?
>
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Topband Reflector