[TowerTalk] homebrew 1:1 current balun

[Kelly Taylor]

If you needed to choke an already-connectorized RG-8-size cable, you could use a pair of Biggest Clamp-on, mix-31 ferrites.

The two clamp-ons would be not far off in price from a stack of five or six 2.4” OD cores, plus you wouldn’t be sacrificing two PL-259s (if you had to cut one off and re-attach another after making the choke).

You should be able to get three turns on each for a total of six turns.

With RG-8X, you can get 7 or 8 turns on each.

73, kelly
ve4xt

> On Dec 2, 2015, at 10:21 AM, Jim Lux <jimlux at earthlink.net> wrote:
> 
> 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>
> 
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