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Re: [TowerTalk] homebrew low voltage surge suppressors?

To: "K4SAV" <>, <>
Subject: Re: [TowerTalk] homebrew low voltage surge suppressors?
From: "Dubovsky, George" <>
Date: Wed, 27 Sep 2006 16:26:56 -0400
List-post: <>
I measured one of their ICE 303 units years ago, and the inductor was 44


geo - n4ua

> -----Original Message-----
> From: [mailto:towertalk-
>] On Behalf Of K4SAV
> Sent: Wednesday, September 27, 2006 4:15 PM
> To:
> Subject: Re: [TowerTalk] homebrew low voltage surge suppressors?
> ..."Their use of a coil across the line is also questionable."...
> -----------------------
> Now that you mention it, I may as well give you the answer.
> I don't know the value of the inductor they use, but a little circuit
> analysis can ballpark the value.  They claim these suppressors operate
> to 1.5 MHz, so in order to keep the SWR under 1.2 at 1.5 MHz, the
> inductor has to be at least 30 uH.  When you take a 30 uH inductor and
> place it in SPICE and drive it with a typical 8/20 us lightning
> at 20,000 amps, the voltage across the inductor goes to about 74,000
> volts. So the inductor isn't doing much by itself.

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