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Re: [TowerTalk] Coax radius

Subject: Re: [TowerTalk] Coax radius
From: K8RI <>
Date: Sat, 06 Oct 2012 22:01:51 -0400
List-post: <">>
On 10/6/2012 8:07 PM, Mike wrote:
I'm planning on using Buryflex coax to wind common mode chokes using
type 31 ferrites for my 80/160M slopers. I'll be able to get 5 turns
thru 2 stacks  of 4 each ferrites. A sort of oval roll of coax with 4
ferrites on each "straight" side.

The Davis website lists 2"min as the bending radius. What's the smallest
practical coil to make in hopes of mitigating conductor migration?

I have several configurations.
The one on the 75 meter fan dipole is 5 core, 6T of BuryFlex(TM)
I have one that is 6 core, 7T for the 160 half sloper that is laying on the work bench at present. It does take a little wire soap to get 7 turns on a single stack.

Turn radius varies from 3" to almost 5" with the larger radius being on the longer stacks.

So far all are single stacks, but I may go with a pair similar to yours for 160 which will go into a PVC electrical box. with the aim of making a circle out of the 6 coax turns.

I need to set them up and run tests with the VNA to see just how well they do.


Roger (K8RI)

73, Mike NF4L

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