In the "old" days with analog cable TV channels, the cable companies had an
extra incentive to keep RFI from their cables low: When the cables radiate
anything, there is also ingress into the cables (from broadcast stations,
from ham radio operators, and from other 2-way radio services), and this
tends to cause herringbone and other interference problems to their own
customers. So it was in their best interests to use well shielded cable and
to keep their cable plant in good condition; and in some cases (or so I've
read), that was enough to keep them on their toes and fix any leakage
problems before people had a chance to complain about interference from the
cables out.
Now that digital has or is replacing analog NTSC on many cable systems, I
fear that this particular incentive may be largely gone. The digitally
encoded signals tolerate more RFI ingress before anything goes wrong for the
cable customer.
Andy
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