The PDF that Ken provided is the more comprehensive version of the NCJ
article.
The attached also discusses some of the design considerations at VP6DX
(2008).
73,
— Eric K3NA
> On Jul 30, 2023, at 12:03, KEN CARUSO <wo1n@comcast.net> wrote:
>
> Hi Dave,
>
> I have some design experience for POTS lightning protection. GDTs were
> sometimes used but by the end of my design career we were using mostly solid
> state devices (TVS and other SCR like devices).
>
> Our golden rule was to avoid turning common mode surges into differential
> mode as even the solid state devices would have differing turn-on thresholds
> which would result in higher voltage stresses on the downstream electronics.
> This meant the protection would go only across tip to ring and never
> tip-to-ground or ring to ground. GDT's were even worse in this respect.
>
> Having said that, I would recommend you dig around for articles written by
> K3NA related to phased array receive antennas used on Ducie etc. He thought
> through protection schemes that involved GDTs, Fuses and TVS solutions. Very
> thorough designs.
>
> I remember his designs were documented in the Sept/Oct 2008 and Nov/Dec 2008
> NCJs but I was not able to find an archived copy on the web, though this
> seems to be a version of what I remember:
>
> https://ncjweb.com/bonus-content/200807NCJVP6DXreceiveantenna1.pdf
>
> 73,
>
> Ken - WO1N
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