Is a Buried Ground Rod for the A-C Mains Service Entrance to a Building Also Useful as an R-F Ground?
Amateur Radio Asked on September 27, 2021
A NEC4.2 analysis of the performance of a buried ground rod at the A-C mains entrance of a building shows it be ineffective in removing the common-mode r-f current that can flow along the OD of the shield of a coaxial cable between the transmitter and the input terminals of a dipole antenna.
One Answer
A rather common expectation is that bonding the outer surface of the shield of a coaxial cable to a buried ground rod effectively "grounds" that conducting surface at radio frequencies. If that was true, then it would be a good means of removing common-mode currents that can be present in some typical antenna/transmit systems.
The study below is an examination of this, leading to the OBSERVATION it includes for the conditions shown there.
Answered by Richard Fry on September 27, 2021
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