To: | "'Jim Lux'" <jimlux@earthlink.net>, <Telegrapher9@aol.com>,<ersmar@comcast.net>, <w1ksz@earthlink.net>,<towertalk@contesting.com> |
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Subject: | Re: [TowerTalk] Antenna/Tower Grounding (Lightning Protection) |
From: | "Gary Schafer" <garyschafer@comcast.net> |
Reply-to: | garyschafer@comcast.net |
Date: | Thu, 4 Jan 2007 11:05:29 -0500 |
List-post: | <mailto:towertalk@contesting.com> |
> > A common > >direct stike is 100 kA with a risetime of 8 us, correct? > > A more common waveform would be rise time of 2 microseconds, fall to > 50% in 50 microseconds. Typical average stroke is 20-30kA. 100kA > would be a big-un The industry standard for protection device comparisons is a waveform of 8x20 microseconds. You want to see how much energy is let through with a given size strike with that wave form. If they don't tell you the let thru energy, look to someone else. However as Jim noted 2 microseconds is a more typical lightning rise time. 73 Gary K4FMX _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk |
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