[Amps] T networks and harmonics

[Peter Chadwick]

One of the problems here is that the various parts of the FCC don't talk to each other! Made worse by the fact that Bill Luther who goes to the relevant bits of ITU Study Group 1 and Bill Cross, who does the technical stuff on Part 97 in Washington, are both hams.
The ITU-R Recommendation SM329 on spurious emissions, which is incorporated by reference into the Radio Regulations (which are considered as International Law) actually requires spurious emissions from amateur stations operating below 30MHz to be -43 +10 log P dB down, but not exceeding 50dB down. The FCC, having signed up to this, then managed to make a mess of incorporating the requirements into Part 97. But the ITU recommendation refers to the harmonics measured at the transmission line, so the attenuation of a tuner is quite permissible.
In reality, a few sums can be done to show how far down the harmonics are if you can't measure them.
73
Peter G3RZP