Home › Forums › temp › Location/Effectiveness of RF Grounds Used with Monopoles › Offset R-F Grounds Relevant to TH Systems
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Reportedly the TH system uses a path from the transmitter chassis and power supply via the a-c wiring in the building to reach an r-f ground supplied by a vertical rod buried at the a-c service entrance of the building. This situation is similar to the NEC model shown above.
From the analysis in the opening post of this thread, it can be seen that there would be much less loss in the r-f ground connection if the TH was used with its external ATU installed outside, a few inches above the earth, with its r-f ground terminal connected to a symmetrical set of buried radials at their common point under the base of the 3-m whip.
But using an elevated installation of that ATU with a lengthy conductor leading vertically down to the common point of the buried radials or just a single ground rod buried there would be non-compliant with §15.219(b), which might result in an FCC NOUO, however unlikely some consider that to be. The installation configuration is the operator’s choice.