"Reg Edwards" wrote in message ...

Hi Reg,
unmistakably, the number of radials is not the only measure of the
goodness of RF grounding. Their length related to the working
wavelength is certainly significant as well - imagine 120 radials 1
meter long each at 160 m ... The soil structures underneath and beyond
the radials play an important role, too. An analysis of this problem
is given in the famous book by John ON4UN.

The following ranges are suggested:

Excellent : 2 ohms or less.
Good : 2 to 5 ohms.
Average : 5 to 15 ohms.
Poor : 15 to 50 ohms.
Awful : Greater than 50 ohms.

Are these in the right ball-parks? Depends on frequencies of occurrence.

IMHO they are right at shortwaves. One problem: how to measure the
grounding resistance simply ? It should be measured at the working
band. Measurements with a ground resistance meter may apply to static
and lightning protection (which is VERY IMPORTANT, too), but not to
RF.

BR from Ivan OK1SIP