[TowerTalk] Verticals and well pipe grounding

[jimlux]

On 2/6/16 3:02 PM, Jim Brown wrote:
> On Sat,2/6/2016 11:07 AM, Donald Chester wrote:
>> RF only penetrates the ground a few feet.  A 190' well casing wouldn't be
>> much better than a couple of 8' ground rods.
>
> N6LF has shown that skin depth of soil is typically 60 ft or more on
> 160M, less at higher frequencies.



Using N6LF's formulas I get skin depths around 5-10 meters at 2MHz 
(0.005 S/m, epsilonr = 3-10)

You might get 60 feet (20 meters) if the soil is particularly 
non-conductive (rock).  Dropping the conductivity to 0.5 mS/m gives you 
skin depths of 22-34 m at 2MHz

At 7 MHz
5mS/m and 3-10 epsilon -> 1.8-4 meter skin depth
50mS/m -> 90 cm.

(that conductive swamp is looking pretty good)








>
> 73, Jim K9YC
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