On 10/6/12 10:01 PM, K8RI wrote:
Thanks, Roger. The choke in the pic looksw like it's been up a while, I
guess you haven't noticed any change due to conductor migration.
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
73, Mike NF4L
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