Understand your preference for enameled wire.
On the other hand have used the Salas-recommended wire (see link below) with no
problems at HV.
http://www.ad5x.com/images/Articles/Current%20Balun%20RevA.pdf
And let us know wazzup with your new project NOT using RG-142 and the stainless
steel conductor.
73,
Ed McCann
AG6CX
Sausalito
Sent from my iPhone
> On Jan 28, 2018, at 6:02 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>
> I'm once again considering winding high power chokes with enameled wire. Zo
> of a closely #12 pair is about 53 ohms, which makes it desirable IF breakdown
> voltage is sufficient. I would appreciate for sources of #10 or #12 enameled
> wire with published breakdown specs.
>
> I've found that THHN (about 93 ohms Zo) works fine for simple antennas like
> dipoles, but some multiband antennas with complex matching/coupling systems
> don't like that much mismatch. We had this problem with the Force 12 C3SS,
> the choke is enameled #12 of unknown pedigree. No breakdown issues with a
> 600W power amp and the antenna is a good match to it, but the engineer in me
> wants to be conservative for legal limit to an 80/75 dipole that I use from
> 3.5-3.9 MHz.
>
> Yes, I know I could put the conductors in Teflon tubing, but that increases
> Zo. I've measured #12 pairs with various Teflon insulation and get values
> around 101 ohms at HF.
>
> Suggestions?
>
> 73, Jim K9YC
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|