Informative discussion, thanks.
As you discuss ground moisture, keep in mind that I am in the Sonoran
desert of Arizona. The regular well that's supposed to supply four
houses (right now, barely mine) is at least 1000 feet deep (I've
forgotten the exact number, but much deeper than what I had in
Minnesota).
If there's a water table nearby, I don't know where it is :) . I'm
1400 feet above sea level and the nearest (dry) river, the Gila, is at
about 1150.
The ground here is fairly hard; does not retain water well. Despite
being 200 feet at least above the nearest flood plain, we worry about
flash floods when it does rain. Water doesn't hang around here.
Larry Wo0Z
On Sun, Sep 2, 2012 at 7:50 PM, Jim Lux <jimlux@earthlink.net> wrote:
> On 9/2/12 7:35 PM, K8RI wrote:
>>
>> On 9/2/2012 8:59 PM, Jim Lux wrote:
>>>
>>> On 9/2/12 5:20 PM, Jim W7RY wrote: Keep the
>>>>
>>>> rods spaced at lest 1.5 to 2.0X length of the rod. Installing rods on
>>>> the ground conductor as it runs between the house and tower base is also
>>>> a good idea.
>>>
>>>
>>>
>>>
>>> I'm wondering what the theory behind that would be. The ground wire
>>> itself provides a fairly good connection to "earth" for the lightning
>>> impulse, especially after the soil has settled in a bit.
>>
>>
>> Until you have a dry spell. Currently the water table here is around 5
>> to 6 feet while the surface foot or so is powder dry. In the spring the
>> water table is about 6" down in the back yard. Note the clay "chips"
>> http://www.rogerhalstead.com/ham_files/tower10.htm
>>
>
>
> Yes, but the vast majority of ground rods are installed where the water
> table is nowhere near the bottom of the ground rod. Just because the soil
> appears dry doesn't mean it's zero conductivity (that whole 13/5 "normal"
> soil thing)..
>
>
>
>
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