Given a 100 KW transmitter, with 2nd harmonics 40 dB down
from the
fundamental (which would be considered reasonably good
suppression) is still 10 watts at the 2nd harmonic,
I'm not sure about Europe but the Amateur radio *minimum*
standard at HF for 1500 watts is about 45dB down for any
spurious or harmonic. While there are lower suppression
levels at lower power, it is set at a 50 milliwatt maximum
limit.
The USA commercial BC standard is in the -80dB range, I
can't remember the exact amount. I just dealt with that with
an AM BC station 100 miles from here that had a spur on 160
meters that was in the -40dBc range.
In all cases there is an overriding regulation that says no
matter what the level of spurious or harmonic, the unwanted
emission cannot cause interference to a licensed service.
This doesn't prevent BC stations from violating rules,
especially in the USA with the poor enforcement and poor
maintenance, but the rules themselves are pretty
strict. -40dB would be considered very very poor
suppression.
73 Tom
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