[RFI] Choke questions

[K9MA]

Back in my spacecraft hardware building career, it was well known that 
Teflon would "cold flow". Great care was taken where wires went around 
corners, etc., that there was no pressure on the insulation. Has anyone 
heard of such issues with chokes?

73,
Scott K9MA


On 1/21/2020 12:21, Jim Brown wrote:
> On 1/21/2020 9:32 AM, EDWARDS, EDDIE J via RFI wrote:
>> Use coaxial cable when making RF chokes for antenna systems.
>
> Parallel wires work fine for winding chokes. There's no need for 
> shielding -- the field from the choke is confined to the core.
>
> At least half of the chokes in my station are wound with a pair of 
> Teflon insulated #12 stranded silver-coated copper wire. The rest are 
> wound with RG400. The Cookbook includes data for #12 THHN as a lower 
> cost alternative.
>
> http://k9yc.com/2018Cookbook.pdf
>
> 73, Jim K9YC
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi


-- 
Scott  K9MA

k9ma at sdellington.us