[TowerTalk] Voltage Breakdown For Enameled Wire

John Simmons jasimmons at pinewooddata.com
Sun Jan 28 21:35:37 EST 2018

Have you thought of using a 1:1 balun of the guanella type? I built mine 
using RG400 and one core. No signs of problems at the legal limit and 
2:1 SWR.

-John NI0K

> Jim Brown <mailto:jim at audiosystemsgroup.com>
> Sunday, January 28, 2018 8:02 PM
> 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
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