[TowerTalk] grounding (again)

Jeff DePolo jd0 at broadsci.com
Sun Apr 22 19:56:58 EDT 2018

>  I did the math on this 
> a long time ago,
> > but as I recall, 4" strap has about half the inductance as 
> #2 wire for a 12"
> > length.  1" strap doesn't have appreciably less inductance 
> than #2 round
> > wire.
> > 
>   4" strap will have almost the same inductance than AWG 2 wire.

I started to doubt my memory after I read your email, but I believe I was
correct as originally written.  A 12" length of wire with a diameter of 250
mils (about #2 AWG) has an inductance of 275 nH.  A 12" length of copper
strap 4" wide and 12.5 mils thick (about the same cross-sectional area as
the 250 mil wire) has an inductance of 144 nH, or about half that of the
wire.  You can check my math if you want.

				--- Jeff WN3A

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