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A CC system under part 15 has an advantage not available to antenna type part 15 transmitters. … This difference is so profound that it invalidates any comparison between the two types of part 15 transmission.
The difference for a permissible radiated field may not much favor §15.221 CC systems over systems operating under §15.209 or §15.219.
For examples of these three, legal systems at 1650 kHz:
§15.209 permits a radiated field of 14.55 µV/m at a distance 30 meters away from the transmit antenna system.
§15.219 has no limit on radiated fields, as long as the input power to the final r-f stage in the transmitter does not exceed 100 milliwatts, and the total length of the radiating conductors in the antenna system does not exceed 3 meters.
§15.221 permits a radiated field of 15 µV/m at a distance 29.92 meters away from the ac- wiring or leaky coax cable used for the transmit antenna system. Note that this limit is virtually the same as permitted by §15.209.
The clear winner here as far as legal radiated fields is a system operating under §15.219 — although probably that was not the intention of the FCC when they added §219 to Part 15.