Fellow radiators:

To Find Your Soil's Electric Conductivity

1) Go to: http://websoilsurvey.nrcs.usda.gov/app

2) Click on the big green button, "Start WSS".

3) Follow step 1 of "Three Basic Steps" on the first page.

Typing your address under "Quick Navigation" is the

easiest method. Remember to spell out street, circle...

When using the + and - zoom feature, click on + or -.

Then place the cursor at the point you wish to be the

center of your next map and click.

4) Click on "view".

5) Click AOI tab which is just above the map and outline

(draw a box

around) your Fresnel Zone.

6) Follow the second step "View/Explore" by clicking

the "Soil Map" tab.

7) Click the "Soil Data Explorer" tab.

8) Click the "Soil Properties and Qualities" box which is

just above the map.

9) Click the "Soil Chemical Properties" box.

10) Click the "Electrical Conductivity" box.

11) Toward the bottom of the page, locate "Top Depth" and

enter 1.

For the bottom depth enter 144 for 14 Mhz, 360 for 1.8 Mhz.

12) Click inches.

13) Click "View Rating".

14) In the table, read in the column "Rating (millimhos

per centimeter)".

15) Use the millimhos/centimeter number as mS/m.

Thus, 17 millimhos becomes 17 mS/m. This is the

electrical conductivity of your Fresnel Zone.

16) This page is printable from your screen to your printer.

Best regards,
Will

KA3VID wrote:
Fellow radiators:

To Find Your Soil's Electric Conductivity

1) Go to: http://websoilsurvey.nrcs.usda.gov/app

2) Click on the big green button, "Start WSS".
. . .

This might be fun to do, but it probably doesn't really tell you your
soil's conductivity, which can vary a great deal from lot to lot and
even within a yard. And if it does, it's likely to be only the surface
conductivity. The skin depth for average soil is around 12 - 15 feet
over the HF range, so substantial current flows to that depth and below.
Typical soils are stratified, with potentially very different
conductivities at different depths.

So, after going through this exercise, you have a number. But that
number is of no real use.

Roy Lewallen, W7EL

This might be fun to do, but it probably doesn't really tell you your
soil's conductivity, which can vary a great deal from lot to lot and
even within a yard. And if it does, it's likely to be only the surface
conductivity. The skin depth for average soil is around 12 - 15 feet
over the HF range, so substantial current flows to that depth and
below.
Typical soils are stratified, with potentially very different
conductivities at different depths.

So, after going through this exercise, you have a number. But that
number is of no real use.

Roy Lewallen, W7EL



I think in my case it was accurate.... we came up with a big fat
zero..... but then again, we are on at least several feet of pretty pure
sand.



Ed K7AAT

"Roy Lewallen" wrote in message
newsKSdnS61XJKDmoPVnZ2dnUVZ_gOdnZ2d@easystreeton line...
KA3VID wrote:
Fellow radiators:

To Find Your Soil's Electric Conductivity

1) Go to: http://websoilsurvey.nrcs.usda.gov/app

2) Click on the big green button, "Start WSS".
. . .

This might be fun to do, but it probably doesn't really tell you your
soil's conductivity, which can vary a great deal from lot to lot and even
within a yard. And if it does, it's likely to be only the surface
conductivity. The skin depth for average soil is around 12 - 15 feet over
the HF range, so substantial current flows to that depth and below.
Typical soils are stratified, with potentially very different
conductivities at different depths.

So, after going through this exercise, you have a number. But that number
is of no real use.

Roy Lewallen, W7EL

My apologies for suggesting it .........