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Old 12-28-2010, 09:46 PM   #1
WD8QBQ
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Default Just kinda interesting

Traveling around and operating the station from different (fixed) locations it sure becomes apparent that some are much better than others.
I use the Early Bird Net on 3.940 mhz as my reference.

There is no scientific measurement, just my perception. For some reason Tallahassee, FL is far superior to Destin, FL, Kissimmee, FL, and Crystal River, FL and they are all relatively close to each other and with similar sandy ground. I know the Ionosphere is not the same from time to time and place to place, but ............just sayin.



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Old 12-29-2010, 09:25 AM   #2
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You know I never considered that possibility, but I'm sure mineral content, ground water level and such things as that would have some effect, just as laying out ground radials under a verticle. I'm really no autority on this subject, I'm just assuming.



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Old 12-29-2010, 07:59 PM   #3
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Default Ground Conductivity

Below is a link to a "HOW TO" site you might find interesting.

http://www.ehow.com/how_7215160_out-...ductivity.html

Also if you do a "GOOGLE" search for ground conductivity map you will find several maps that have a "BALL PARK" rating of conductivity in the U.S. .

Soil conductivity will depend on several things among those are , level of water table, type of soil, salinity content, mineral content, there is quite a string of variables that need to be considered.

73, John
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Old 12-30-2010, 02:50 PM   #4
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Thumbs up

John, I did find that interesting, thanks for the post. I'm Googling for the map


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Old 12-31-2010, 05:20 AM   #5
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Very interesting... Thanks for the post John.



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Old 12-31-2010, 06:58 AM   #6
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Default Ground Conductivity

To carry this a bit further (and because it never dawned on me that some people may not relate to "millisiemens").

Here is another link to another web site that explains the conversion or relationship a bit better.

http://www.sensorex.com/support/educ...education.html


Happy New Year All !
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Old 01-04-2011, 02:09 PM   #7
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So the higher the number......


Here is how to measure it, or more correctly, calculate it where you live.

Go to: http://www.ehow.com/how_7215160_out-...ductivity.html
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Old 01-04-2011, 03:48 PM   #8
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I hope this is a question..................

The higher the number the MORE RESISTIVE the soil is (just like using an ohm meter to measure a resistor).

Another approch to this would be to put an A.C. ammeter in the circuit after the light bulb and then use Ohms Law to work out the resistance of the ground.
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Old 01-04-2011, 07:03 PM   #9
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Quote:
Originally Posted by KC1BUD View Post
So the higher the number......


Here is how to measure it, or more correctly, calculate it where you live.

Go to: http://www.ehow.com/how_7215160_out-...ductivity.html
Yea, that's right, reminds me of John's post #3.


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