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w_tom wrote:
Do you write this drivel every time, or do you copy and past it? Once again, your knowledge of a number of systems is evident. I have seen a lot of damaged telco equipment. In fact, I've been in the Sprint warehouse in Eustis, Florida where they had skids full of lightning damaged circuit boards being sold as scrap. If the wire is never damaged, why do they build their plant with extra pairs? Those pairs are exempt from tariffs, as long as they are only used to replace a damaged pair. I lost my underground phone line when lighting struck an old barn on our property. We had a light out there, so lightning got into our electrical service. Everything critical was on plug in MOV protectors and they all survived. The lightning jumped from the underground power line to Sprint's buried line which they had installed a few inches from the existing buried power line. The pair of wires was vaporized to the street which was over a mile. It wiped out the line card in the pedestal, and the pair back to the CO was damaged. All 16 customers fed by that pair had excessive noise on their phones so they had to switch to one of the spare pairs. That lightning strike did thousands of dollars worth of damage to their equipment, and took weeks to fix. Now, tell us again that Telcos don't suffer lightning damage. -- Former professional electron wrangler. Michael A. Terrell Central Florida |
Hi Mike. In an earlier post it was stated that "replacement value
homeowners insurance" is the only true protection for a lightning strike and that is still the surest bet. NOYK in SW Ocala |
In article ,
"Michael A. Terrell" wrote: w_tom wrote: Do you write this drivel every time, or do you copy and past it? Once again, your knowledge of a number of systems is evident. I have seen a lot of damaged telco equipment. In fact, I've been in the Sprint warehouse in Eustis, Florida where they had skids full of lightning damaged circuit boards being sold as scrap. If the wire is never damaged, why do they build their plant with extra pairs? Those pairs are exempt from tariffs, as long as they are only used to replace a damaged pair. I lost my underground phone line when lighting struck an old barn on our property. We had a light out there, so lightning got into our electrical service. Everything critical was on plug in MOV protectors and they all survived. The lightning jumped from the underground power line to Sprint's buried line which they had installed a few inches from the existing buried power line. The pair of wires was vaporized to the street which was over a mile. It wiped out the line card in the pedestal, and the pair back to the CO was damaged. All 16 customers fed by that pair had excessive noise on their phones so they had to switch to one of the spare pairs. That lightning strike did thousands of dollars worth of damage to their equipment, and took weeks to fix. Now, tell us again that Telcos don't suffer lightning damage. He is a well know Troll and been around for years. He is in just about any new group that has to do with electronics or electricity or phones. A Google search will show he infests many news groups. Always the same line of crap. A real nut case. Do yourself a big favor and drop kick him into the kill file. -- Telamon Ventura, California |
"Eric F. Richards" wrote:
"Michael A. Terrell" wrote: wrote: I don't want to start a pising contest, but you might want to visit a local TV or radio station. They take lightning hits all the time and very seldom have anything more then a sec or 2 of off air to show for it. Really? A friend of mine makes over half his income from repairing lightning damaged radio stations here in Florida. While I was the engineer at WACX TV lightning hit their studio building in Leesburg Florida. It took ot the entire telephone system, the main computer, all the terminals, all the LNAs on the C-band dish, most of the receivers and the 11 GHZ CARS transmitter that fed the original transmitter site. It took months to repair everything, including replacing the vaporized grounding system. true, if you're in an area that rarely get nearby lightning strikes, but there have been storms here with over 1100 strikes in 30 minutes. The continuous EMP weakens things, and there are a lot of failures because of this. I lost all three video amps in a computer monitor when lightning hit the water behind my workshop. It wasn't plugged in, and the video cable was wrapped around the tilt stand, yet enough voltage was induced into the cable to blow a crater in the video amp chips. A battery powered digital thermometer hanging on the wall exploded. The IC was vaporized and a hole burnt in the circuit board. In truth, there is little that can be don to protect you from a direct lightning strike. AM radio towers have a huge spark gap at the base to protect the insulator, but damage to the antenna system are common. Also, a lot of stations have a spare transmitter that's already hot, so they can switch over and get back on the air, "In a couple seconds" Yes, some TV stations get damaged. But invariably they violate the proper designs of a lightning mitigation system. All that it takes is a single conductor that doesn't go through the ground window. No, everything went through one ground, but the strike wasn't on the tower, it hit the poured concrete building in multiple locations. It was a single level, flat roof with a wall around the outside edge. The concrete finish cap was missing in a lot of places after the storm. Years ago I worked on a fairly expensive project, set up on a mesa in Colorado, with an antenna higher than any object in about a 5 mile radius. The other users of that site were habitual in plugging something into the protected side of the ground window and then putting on a metal rack on the unprotected side of the window. Because of that habit, they will no doubt lose their equipment in a direct strike. ...and there's no need. As for damage to the antenna systems... some times it can't be avoided. But many times it can. In that case, all it needs to have is a low impedence path to ground in the case that lightning strikes. Gas discharge tubes (or spark gaps, but far less controllable) provide that during a strike. The tube has to be able to survive for the lifetime of the strike, no longer. If it shorts, well... it did its *job*. -- Eric F. Richards When the strike hits the building rather than the tower, its going to do damage. There were chunks of concrete blown out of the building, exposing rebar and 1" threaded rod that held the concrete roof to the pillars in the parking lot. The ground conductors for the building vaporized, but it was replaced with newer and heavier grounding, including a 4" metal conduit run from the equipment racks to the tower. I moved the microwave racks from the center of the building into a tiny closet as close to the tower as I could, rebuilt all of the electronics, and added another set of ground rods where the 4" conduit entered the building. After that, there has been no damage, even though the tower has had some strikes. It will fail again, some day because the weather here in Central Florida corrodes everything over time. -- Former professional electron wrangler. Michael A. Terrell Central Florida |
Telamon wrote:
In article , "Michael A. Terrell" wrote: He is a well know Troll and been around for years. He is in just about any new group that has to do with electronics or electricity or phones. A Google search will show he infests many news groups. Always the same line of crap. A real nut case. Do yourself a big favor and drop kick him into the kill file. -- Telamon Ventura, California I know he's a troll, but I don't want others to be fooled by his cut and paste BS. I think he does a search for the word lightning and attacks. Maybe I should change the "Organization" line of my header so he'll see every post I make, in every newsgroup. If enough people did that he would have to work quite hard to troll. -- Former professional electron wrangler. Michael A. Terrell Central Florida |
No One You Know wrote:
Hi Mike. In an earlier post it was stated that "replacement value homeowners insurance" is the only true protection for a lightning strike and that is still the surest bet. NOYK in SW Ocala It cost our insurance company some money, but I'll bet that Sprint spent $10,000 to fix everything in that Lake County strike that vaporized the underground phone line. They had to bury a new 25 pair line to all the pedestals on my road, and a new six pair a quarter mile to the house because everyone on the old cable had intermittent noise on their phones. They had to replace the guts in several pedestals because their lightning protectors failed and left nice burn marks. BTW, are you getting ready for the hurricane season? I'd like to buy a 3 KW or larger generator while we have the sales tax holiday, but I just don't have the extra cash right now. I finally got a truck and fixed it so I don't have to depend on someone else to take me places. I've already spent $200 on it in less than two weeks and I still need to fix the air conditioner. -- Former professional electron wrangler. Michael A. Terrell Central Florida |
"Michael A. Terrell" wrote in message ... Telamon wrote: In article , "Michael A. Terrell" wrote: He is a well know Troll and been around for years. He is in just about any new group that has to do with electronics or electricity or phones. A Google search will show he infests many news groups. Always the same line of crap. A real nut case. Do yourself a big favor and drop kick him into the kill file. -- Telamon Ventura, California I know he's a troll, but I don't want others to be fooled by his cut and paste BS. I think he does a search for the word lightning and attacks. Maybe I should change the "Organization" line of my header so he'll see every post I make, in every newsgroup. If enough people did that he would have to work quite hard to troll. -- Former professional electron wrangler. Michael A. Terrell Central Florida Well Michael. I've never heard of anyone's radio surviving a direct hit so it was news to me. I've seen guys put ground radial out like a spiderwebs all around their towers but I'm not convinced anything can absorb the entire brunt of a direct strike without some energy traveling up the feed line. Every ham or electronics tech I've ever spoke too has said just unhook your equipment in a storm and save yourself some grief. -- 73 and good DX. B.H. Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm |
I know he's a troll, but I don't want others to be fooled by his cut
and paste BS. He showed up in a bass player's newsgroup a couple of months ago with endless, rambling posts about power conditioning and voltage-spike protection -- just tons of unintelligible gibberish, cut and pasted without any sense or conclusion. He avoided every question posed to him with more loads of gibberish. Weird guy, but some people are taken in by his quasi-knowledgeable tone. |
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