[TowerTalk] Voltage Breakdown For Enameled Wire
edwmccann at yahoo.com
Mon Jan 29 12:36:52 EST 2018
Understand your preference for enameled wire.
On the other hand have used the Salas-recommended wire (see link below) with no problems at HV.
And let us know wazzup with your new project NOT using RG-142 and the stainless steel conductor.
Sent from my iPhone
> On Jan 28, 2018, at 6:02 PM, Jim Brown <jim at 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.
> 73, Jim K9YC
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