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The Manual for the SSTran AMT5000 High Efficiency Transmitter says on Page 24, “Ground. A good, low impedance, ground is required for best range. Just as the transmitter will not work without an antenna, it likewise will not work without a ground.”
The conditions quoted above apply to any and all transmit systems using a monopole antenna — including licensed AM broadcast stations.
No mention is made of the grounding aspect of the AMT5000 test, rendering the published test results invalid.
Not true, Carl, because all of the transmitters in that test reportedly were driven against the same r-f ground using the same tx input power, on the same frequency, and on the same day (I think).
All of those transmit systems (when legally optimized) could have produced greater measured field intensities in those tests if they had been driven against an r-f ground having less loss resistance than provided by a single ground rod.