OK. I did, and here it is:

S 97.121

(a) If the operation of an amateur station causes general interference
to the reception of transmissions from stations operating in the domestic
broadcast service when receivers of good engineering design, including
adequate selectivity characteristics, are used to receive such
transmissions, and this fact is made known to the amateur station
licensee, the amateur station shall not be operated during the hours from
8.PM to 10:30PM local time, and on Sunday for the additional period from
10:30AM unti 1PM, local time, upon the frequency or frequencies used when
the interference is created. (b) In general, such steps as may be
necessary to minimize interference to stations operating in other services
may be required after investigation by the FCC.

I don't see where the above applies to Internet service providers.
They are not licensed stations, per se, anyway. You might also note how
cable TV stations are dealt with under similar circumstances. They are
always at fault if there is an RFI problem.

Ed WB6SAT

broadband DMT modems do not have selectivity. They use wideband filters
in the front end and line driver areas (or perhaps none, in case of
annex C) and do the frequency selection in DSP. They don't have
"adequate selectivity characteristics".

Nor are they receiving transmissions from "stations in the domestic
broadcast service". In fact, BPL systems do not appear to me to be
"stations" operating in _any_ service. Hence, I don't think that
either clause of 97.121 applies.

That's not to say that the FCC won't contrive to pull a "through the
looking glass" inversion, and come out with a ruling requiring
licensed radio services to shut down to protect unlicensed land-line
services.

--
Dave Platt AE6EO
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