TT:
I found these articles to be of value in understanding how arresters from
Polyphaser, ICE and Delta operate: http://www.iceradioproducts.com/33.htm
http://www.iceradioproducts.com/33a.htm . Both of these papers, and others on
the subject, can be found at: http://www.iceradioproducts.com/10.html .
Enjoyable reading for a cold Sunday afternoon.
73 de
Gene Smar AD3F
-------------- Original message ----------------------
From: Red <RedHaines@centurytel.net>
> Greetings, TowerTalkers;
>
>
> ICE parallels the GDT in their feedline lightning arrestors with an
> inductor. The GDT responds quickly to a transient to conducts high
> current while the current shunted by the inductor must increase in
> accordance with the voltage-current-time relationship of an inductor.
> However, the inductor does relieve the GDT of having to pass the entire
> current for the duration of the event. Thus, the inductor is thought to
> prevent failure of the GDT.
>
> I haven't found authoritative information on GDT failure modes. I hope
> to find that in one of the many references listed by Rakov and Uman,
> including "Protection of Electronic Circuits from Overvoltages," by R.
> B. Standler, 1989. I have requested a copy of that via inter-library loan.
>
> Meanwhile, an inductor from a vertical antenna element to ground is a
> good idea. It must be a low impedance ground, preferably better than a
> single ground rod. I believe an inductor across the elements should
> also work on a dipole.
>
> A high quality lightning arrestor should be installed in the feedline
> from any antenna. No other part of the ham station is more likely to be
> struck or to experience a really strong induced transient from lightning
> than the antenna. I recommend one of the arrestors that employs a
> combination of GDT and a high voltage blocking capacitor, such as the
> PolyPhaser or ICE.
>
>
> 73 de WOØW
>
> Mike Bragassa, K5UO wrote:
>
> >...speaking of lightning:
> >
> >What is a simple and effective ground for my base-loaded 80 meter vertical
> (Rohn 25g)? "Spark gap": How can one be made and what gap is correct?
> >Thanks!
> >Mike, K5UO
> >_______________________________________________
> >
> >
> >
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> >
> >
> >
> >
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