Is is really such gibber?
You seem to have a good understanding of dB.? Here's the text on the specific levels:
¡ì97.307???Emission standards.
...
(d) For transmitters installed after January 1, 2003, the mean power of any spurious emission from a station transmitter or external RF power amplifier transmitting on a frequency below 30 MHz must be at least 43 dB below the mean power of the fundamental emission. For transmitters installed on or before January 1, 2003, the mean power of any spurious emission from a station transmitter or external RF power amplifier transmitting on a frequency below 30 MHz must not exceed 50 mW and must be at least 40 dB below the mean power of the fundamental emission. For a transmitter of mean power less than 5 W installed on or before January 1, 2003, the attenuation must be at least 30 dB. A transmitter built before April 15, 1977, or first marketed before January 1, 1978, is exempt from this requirement.
Seems pretty clear at least for US FCC regulations.? I'm not sure about other countries.
I think most reporting Spectrum Analyzer results here are talking about dB down from the fundamental.
73,
Mark.
