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

[Charlie Cunningham]

Pretty sure it's 73 material, Mike. That's about all I had in my Fair-Rite
engineering and  designer kits.

73,
Charlie, K4OTV


-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Mike
Waters
Sent: Saturday, August 24, 2013 8:12 PM
To: Charlie Cunningham
Cc: topband
Subject: Re: Topband: Two 2:1 transformers to choose from!!

I'm not sure what kind of material you made that from, but 3 or even 4
turns is OK for the low-Z winding on the #73 solid 2-hole cores we were
talking about earlier. It seemed to work well for you. :-)

Sometimes, we have to cascade two transformers to get to the Z ratio we
want.

73, Mike
www.w0btu.com


On Sat, Aug 24, 2013 at 6:38 PM, Charlie Cunningham <
charlie-cunningham at nc.rr.com> wrote:

> 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.
>
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