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## Re: [TowerTalk] tower ground question

 To: Gene Smar , Erichardson@winnipeg.ca, towertalk@contesting.com, jim Jarvis Re: [TowerTalk] tower ground question Jim Lux Jim Lux Thu, 29 May 2008 10:09:35 -0400 (EDT) mailto:towertalk@contesting.com>
 ``` N2EA wrote > > > >Remember, a 90 degree bend in a ground wire is an inductor, and you >want a low impedance >path for strike current. I would run that 1.5" strap from each >tower leg, with an 18" radius bend, >over the foundation, and out to each ground rod. Is there a (probably empirically derived) approximation for the inductance of a bend in a wire. For straight wires, a handy approximation is 1 uH/meter. For a curve, are we basically talking about using a standard single turn coil formula, with 1/4 turn? Some online sites give quick and dirty equations along the lines of L=mu0 * pi * radius.. in any case, an inductance around 1 uH for 1m circumference (radius = 1/2pi meters.. call it about 6"). This would imply that the 90 degree bend is around 0.25 uH. At 1 MHz, that's an impedance of around an ohm or two. Jim, W6RMK _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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