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Re: [TowerTalk] my long lightning story (was RE: lightning strike)

To: towertalk <>
Subject: Re: [TowerTalk] my long lightning story (was RE: lightning strike)
From: Charles Gallo <>
Reply-to: Charles Gallo <>
Date: Fri, 30 May 2008 05:22:00 -0400
List-post: <">>

On 5/30/2008 Roger (K8RI) wrote:

> According to the NWS literature a strike a mile away can induce voltages
> as high as a 1000 volts per meter in a piece of wire.

One interesting item of note, and this article is making me "think" (a bad 

This weekend I got a tour of a USCG Cutter (The Katherine Walker WLM 552), and 
something I noticed when we walked past the LAN room - they are NOT using 
100BaseT LANs, but everything is fibre optics

I wonder if fibre (which, interestingly is mostly "the past" in LAN design, as 
gigabit baseT is around) would be the/A future way to deal with our gear.  
Think - no ground loop potential, no voltage surge potential etc.  Not cheap, 
by a long shot, but...

I mean, we HAVE to switch to USB in the near future, be interesting if we could 
jump to fibre

and RE Serial Ports.  Back when I used to work in electronics for a living, 
computers were still VERY expensive items, and I designed a few ISA cards for 
custom work (did you know that IBM sold a tech manual with all the 
voltages/pinouts and timings of all the busses?) Anyway, one of my managers 
insisted that EVERY signal in and out of those cards go through an 
optoisolator.  The ones I was using only had a few hundred volt rating, but I 
will tell you - sometimes nasty stuff happened to the units I was connected to, 
and we lost an optoisolator, but we NEVER lost a PC.  Guess that's how you 
build things when you are used to building things "Mil Spec" - you should have 
seen some of the specs for "out of tolerance" voltage inputs on some of the 
units we worked on.  TTL level input  - hit it with 1000 volts, make sure 
things still worked
73 de KG2V

For the Children - RKBA!

Ox2B | ~0x2B


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