Hi, Gene;
I agree that the informed ham should read ICE's material. The informed
ham should also read PolyPhaser's Tech Notes and the book PP publishes.
The informed ham must also recognize some bias and less than technically
correct information in them. I turn to Rakov and Uman and to Standler
for more authoritative information. I value information from Bourns
about GDTs and arrestor components.
I use both ICE and PolyPhaser arrestors in my station and in club
stations with which I am associated and I include their publications as
references when I speak to ham clubs about lightning protection.
73 de WOØW
ersmar@comcast.net wrote:
>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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>>
>
>
>
>
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