"Ground Conductivity Test" is from the ARRL Antenna Handbook...
The book I have is from 1994....and it is on page 27-35 that's chapter 27
page 35........
Conductivity Soil, Measurement of....
It takes 4 rods.......9/16" diameter and 14 inches long these 4 rods are
driven into the ground 18 inches apart in a straight line......drive them in 12
inches...
One side of the 120 AC line to a 100 watt light bulb...the other side of the
bulb to a 14.6 ohm resistor.........they say to make up the resistor by
paralleling 5 of them...3 of which are 68 ohm 1 watt....the other 2 are 82 ohm 1
watt......then the other end of the resistor goes to rod #1 .......the other
side of the AC line goes to the farthest rod.....
You now have two AC voltage test points......V1 is across the resistor. V2 is
voltage measured between rods #2 and #3.....
In general these two voltages they say should be from 2 to 10 volts......
Formula for calculation is......
C = 21 x V1/V2
This gives you the Millisiemens per meter
----- Original Message -----
Sent: Tuesday, December 17, 2002 5:35
AM
Subject: Re: LF: EARTH RESISTANCE
To All from PA0SE
Mike, G3XDV,
wrote:
I think this is why people are confused. I believe that Dick
measured
"system loss", which includes all
losses except inductor loss. Calling it
"earth resistance" simplifies the
situation too much. Plainly a wet
environment will increase
leakages.
I indeed measured the total resistance of
the aerial system (minus the coil loss) as I have explained in my e-mail. I
agree with Mike that "system loss" would have been a better _expression_ than
"earth resistance".
Has anyone measured
earth resistance alone under different conditions? If I
recall correctly,
this can be done with three earth stakes and
Kirchoff's
laws.
Indeed, but it usually done
at 50Hz. To be meaningful at LF the measurement should be performed at an LF
frequency. But I'm afraid that will not be so simple.
73, Dick,
PA0SE
