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|    Message 12,090 of 13,597    |
|    Mike Luther to Mark Hofmann    |
|    Re: UPS units and Lightni    |
|    20 Jun 15 07:53:58    |
      Hi Mark!              You and the others are I think sorta lucky...               MH> When I was around 10 years old, I was looking outside my bedroom window         MH> during a storm and lightning hit our garage right in         MH> front of me. All I saw was white light and an instant         MH> VERY loud boom.                MH> The lightning had hit the corner of our garage and         MH> caught it on fire. I had to go out there and put it         MH> out with the hose. I'll never forget that one!              I too first got introduced to lightning at about 10 years of age when I first       started fooling with radio beginning with crystal sets. Incidentally I still       have my original cat-whisker crystal that I used with the coil wound on an       oatmeal box here in the same room I am typing this message, chortle. At any       rate, I've been closely nudged by lightning 29 times at the last count. My       airplane has been hit directly six times. The Research Vessel Hidalgo for the       Oceanography Departmemt of Texas A&M on which I eventually got my FCC First       Class Marine Radio Telegraph Operator license was hit eight times when I was       on it. Yes, the radio shack was up on the top of the vessel right behind the       captain's room. Twice while I was in Houston walking on Main Street downtown       while I *HAD* to so for emergency reasons, a power line pole next to me was       hit directly! As the Chief Engineer for WTAW radio here in College Station       for years just out of high school here my special knowledge about lightning       strike damage suppression by individual construction for radial wire lobe       creation to carry the hits to the ground surface eventually helped stop damage       from MANY strikes that hit even the power lines that ran the station as well       as the 256 foot high tower for it.              My main type ham radio interest for my still W5WQN call and the Extra Class       license I got at 13 years of age in 1952 has always been on CW 40 meter work       only. That eventually got me 300 40 meter only CW country QSL cards for my       original only ever in the history of the ARRL initial application for my 40       meter CW DXCC award. The antenna array out at our family remote site with       even four tower 80 meter vertical phased array systems I use is hit directly       an average of about three times a year. With my special work for suppression       grounding for everything, including a complete ground radial grid with       multiple dispersion radial spikes on it around the whole house, the last       damage I have ever taken from this was back in I think 1974. However the       worst strike I was personally involved in was out there when I was asleep in       bed about 2AM. The strike blew me out of the bed on the floor! That's when I       put in the ring ground line around the whole place. And by the way - the       normal power line ground spike at the meter is a joke when it comes to       lightning.              At A&M Consolidated High School here in College Station as a freshman, I was       going to dance classes at Texas A&M here. I was very attracted to a beautiful       girl who was a WONDERFUL dance partner. We went toward the top of the heap in       the class until one day when lightning hit the Memorial Student Center during       a class. This girl was from a major cattle ranch down near Navasota about       twenty miles away. After the BOOM I told her about my close calls with       lightning even back then, She ran away from me and never came back to the       classes! Later I found out why. Her Dad was blown off his horse and killed       riding home trying to get out of a storm by a lightning bolt! Their ranch       wound up as being the cattle auction operation for Navasota. I cried when I       found out this.              Key UPS advice to all folks here. You should NEVER use any UPS that does not       use an actual iron core power transformer in it to isolate the entire       protected side of the power it protects through the pig-iron core! The reason       is that a lightning stroke can't really whop things across the pig-iron core!        If you EVER use any item with a switching power supply for the DC voltage it       gives you direct from the power source line, that is a guaranteed suicide for       whatever you thing it is protecting. For years now I have always used only       the APC Smart protection units that have the pig-iron transformers in them.        There are other reasons to Feed-The-Pig beyond money investments, chuckle!              As well, if you are using a major huge rack system for lots of stuff, one of       the best protection methods you can use is to install even a many KW pig-iron       isolation transformer and feed the whole system of computers, printers and       everyting else behind it. With ABSOLUTELY surge protected ground connections       on the whole powerline stuff behind it that are *NEVER* allowed to touch the       standard ground pin or anything connected to it in the whole house.              And remember a lightning bolt is *NOT* just electricity as most people likely       think! It is a RADIO WAVE. Which can vary in quarter wave length amounts       during a strike from even over 250 feet at the start of a strike down to even       only six or eight feet, depending on the frequency of the bolt that chances       during the split second it whops whataver! That's why on the same power line       in your house, sometimes your computer gets blown away while ten feet away       your radio, TV or music set doesn't! Voltage and current swap in peaks every       quarter wave down the metal that carries the radio wave.                     Mike Luther as NC117 from 1:117/100 and still W5WQN.              ---        * Origin: BV HUB CLL(979)696-3600 (1:117/100)    |
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