Really the issue that is important to me here (the point) is practicality, not the extra radiation as you may think. .... I don't care about radiation from the ground, I just want to get the unit installed in a practical manner. I would install a ferrite on both the control and ground wires if the ground was otherwise unshielded.
Those are interesting statements, Keith.
According to FCC 15.219, the elevation above the earth that a "Part 15" AM transmitter and antenna
system is installed is unimportant. What IS important is that the effective radiating length of the antenna
system does not exceed 3 meters.
You are now implying that you are unconcerned if elevated systems use r-f filters in the conducting paths to an r-f / lightning ground (to a grounded, "massive" ground wire, flagpole, mast, billboard steel, building frame etc), and in the program, power and control lines -- all of which, without filters, will radiate even if not connected to a good "ground."
Users of such filtered configurations should understand that when the only radiation from an elevated Part 15 AM system occurs from the ~3-m whip attached to its antenna output connector, then the field strength that can be produced by such configurations will be considerably less than if the system was installed at / near ground level, and used very short,
unfiltered conductors (apart from the 3-m whip).
Elevated and "filtered" Part 15 AM systems are not capable of the same performance as unfiltered systems mounted at / near the surface of the earth, using a very short path to a good r-f ground. But such elevated / filtered systems may be the only viable choice for users wanting to observe the legal technicalities of 15.219, while needing to meet the physical restrictions imposed by their installation conditions.
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