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| To: | <[email protected]> |
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| Subject: | LF: Re: Lightning Story |
| From: | "James Moritz" <[email protected]> |
| Date: | Thu, 28 Jul 2011 00:29:53 +0100 |
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Dear Bill, LF Group,It seems that a lightning strike has a current of 10s to 100s of kiloamperes, with a rise time measuresd in kiloamps per microsecond, so the transient E and H fields must be intense. I guess anything with a substantial length of cable attached is going to be subjected to large induced voltages and current, even without any connections, metallic or via an arc of some sort. From your description, the loop antenna has a relatively long feeder compared to the mini-whip, and this feeder would have acted as the larger side of an asymmetrical dipole "transient antenna", the loop itself being the other side. So perhaps the poor old TL084 had to endure a big transient induced between its input and output, while the protection diodes only had to suffer the transient induced in the loop itself. On the bright side, TL084s are quite reasonably priced fuses, so perhaps an IC socket would be the best investment ;-) Cheers, Jim Moritz 73 de M0BMU |
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