Date: Wed, 2 Dec 2015 08:21:07 -0800
From: Jim Lux <jimlux@earthlink.net>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] homebrew 1:1 current balun
On 12/2/15 7:30 AM, Jim Thomson wrote:
> Date: Mon, 30 Nov 2015 15:11:19 -0800
>
>
> Have you considered using a 2.4" toroid core(s) and running multiple
> turns of the coax through it. I can get about 10-12 turns of 1/4"
> diameter coax (RG58 type) through those cores. I think you can get 3-5
> turns of 0.405" coax (RG213 type) through it.
>
> There's a fairly decent cookbook for this kind of thing, with all the
> measurements on actual chokes, etc. in Chapter 7 of
> http://www.audiosystemsgroup.com/RFI-Ham.pdf
>
> ## You can easily get 7 turns of RG-213U through 2.4 inch OD cores.
> Ditto with RG-393.
> To make for a more compact balun assy, 3-8 cores can be positioned on
> either side, like
> binocular fashion, then tightly wound...if using RG-213U or RG-393.
if there's no connector on the coax<grin>
## Nobody seems to be installing female coax connectors these days on
ants...IE:
f12, etc, etc. That being said, the entire compact mess goes inside a water
proof nema
box, with a gasketed lid, and SS hinges. Then a 7-16 din connector used on
the main
coax side. Standoffs used on the balanced side. But you are correct, if
PL-259s are used,
I think you can get perhaps 3-4 turns through..maybe 5.
Jim VE7RF
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