At 09:43 AM 11/19/2004, Jim Brown wrote: Gentlemen, I'm doing some reasearch for an applications note I'm preparing on power and grounding for audio and video systems, and wanted to mention the use o
Randy: the sudden vaporization of the moisture within causing a violent expansion thereof. A popular belief but not backed up with any evidence to my knowledge. Keith NM5G ___________________________
Randy wrote: It *will* cause concrete to explode exactly like wood, trees, etc., i.e. the sudden vaporization of the moisture within causing a violent expansion thereof. Personally, I wouldn't want s
lightning going ground rods I saw a base pier on a BC tower (self supporting, so it had three or four piers) split from what looked like a big arc. They only had a gap and ground on one leg. It isn'
Where I work we have blown chunks out of concrete utility poles we were testing with artificial lightning. And it is common for chimneys that are hit to suffer damage. I have also heard of pieces be
Here is an excerpt from PolyPhaser's technical document titled Document Number TD1028: An interconnected concrete tower base can help the tower ground system: Concrete is a fair conductor and can be
My 30+ years of experience agrees with Keith. At a number of different locations I have never had a lightning strike to my tower(s) crack the concrete pad. The legs of the towers are attached to grou
In 1966, I lost a tower to a lightning strike. The tower was a 50ft Rohn 25 with three sets of two guys. The tower was grounded an the base with ground rods and heavy guage wire going up about 3-4 ft
I've always heard even from lightning experts that there is little one can do to stop or even minimize the affects of a direct hit. Charlie Ham Radio - AD5TH www.ad5th.com Live Blues Music www.492aco
Very interesting about lightning strikes. Never had it happen to me. Only had a crop duster airplane hit a tower once. Don't think grounding would help that! Thanks to all for giving me something to
They were not experts that you heard that from. It is true that there is nothing you can do to prevent a strike but there is plenty you can do to deal with one and prevent it from doing damage. Light
Author: "K8RI on Tower Talk" <k8ri-tower@charter.net>
Date: Wed, 26 Jan 2005 21:40:36 -0500
The one thing predictable about lightning is its unpredictability. The Science (Discovery) channel had an interesting program on this a couple of weeks back. Lightening varies greatly in strength fro
Did you mean two sets of three guys? Yes, lightning can easily flash over insulators. And yes, not grounding the guy anchors put a huge potential across the concrete. But, take heart as there are pr
I have been hit by lightening too on my HDBX 50 tower - No damage to tower, concrete or antennas. Took out phone line (underground) when came down tower, out three ground rods and 00 wire tying all t
couple While the producers of shows on Discovery Channel usually(!) try to be technically accurate, one should remember that they are being paid to entertain. the The statistics of lightning have bee
to "ring" with a flow. Even when flowing in one direction a waveform can contain multiple high frequency components and act just like AC. Lightning can never be treated like DC. super strikes are co
Tom: Even when flowing in one direction a waveform can contain multiple high frequency components and act just like AC. Lightning can never be treated like DC. This is difficult for me to comprehend.
is flowing in one It isn't *stationary* DC. Ignoring the reversals in polarity, lightning has a rapidly rising and constantly changing waveform with a great deal of high frequency energy. That's why
is flowing in one It isn't *stationary* DC. Ignoring the reversals in polarity, lightning has a rapidly rising and constantly changing waveform with a great deal of high frequency energy. That's why