In a message dated 99-04-13 07:39:40 EDT, w8ji@contesting.com writes:
> > Drive one ground rod in. Then measure straight up about 5 feet, and put
> > in another rod. From that rod, go towards the upper right, at a 45
> > degree angle a distance of 3 feet, in goes another rod. From that rod,
> > go left 4 feet, and plant another one. Now you have a pattern something
> > as follows: __
> > /
> > |
> >
> > Lengths in that are not to scale, but the shape is close to correct,
hi.
>
> Why drive a rod in at an angle?? What is the magic in the odd
> spacings?
This particular scenario was a mystery to me also. I've *never* seen
anything like this in any grounding reference. Generally the useful
hemisphere of a ground rod is equal to it's length. That is, a ten-foot
ground rod will have a ten-foot hemisphere of influence. You would space
ground rods at 1/2 the hemisphere distance times 2 (since you've got 2 ground
rods). This would be ten feet for a ten foot rod. When they're closer and the
hemispheres overlap, you're not taking advantage of the full sphere of
influence.
The rods and ground wires are generally set out in a 'wheel and spoke'
arrangement. I don't have any idea what the idea for a "?" design would be.
Cheers, Steve K7LXC
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