Topband: GDT's for receive ant's

[R. David Eagle]

 Thanks Ken et al.....I appreciate all of the info.  I am going to start reading through the articles when kids hit the hay!  You can really never stop learning in this hobby!  This marks my 30th year.....wow how time flies!

73,
DaveKb8nnu

    On Sunday, July 30, 2023 at 03:14:44 PM EDT, Eric Scace K3NA <eric at k3na.org> wrote:  
 
   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 at 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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